OKfmt
OKFMT

Image, PDF & Subtitle Format Conversion

Image, PDF, Audio, Video & Subtitle Conversion · 188 Tools · Zero Ads

Drag files here or click to upload (multiple files supported) · Ctrl+V to paste from clipboard

WebP · AVIF · HEIC · JPG · PNG · GIF · BMP · ICO · TIFF · SVG · SRT · VTT · ASS — Max file size: 50MB

Convert to PDF5

View all →
SVG

SVG→PDF

Rasterizes SVG vector graphics at 144 DPI into a PDF page whose physical size matches the artwork's logical dimensions, with optional A4/Letter print layouts. Suited for design delivery and print output.

JPG

JPG→PDF

Embed original JPG data directly into a PDF document with zero recompression. Pixel data stays bit-identical to the source, for printing, submission, and archiving.

PNG

PNG→PDF

Embed PNG into a PDF document losslessly, preserving every pixel and the alpha channel, for screenshot archiving, design delivery, and printing.

WEBP

WebP→PDF

Decode WebP images and embed them as lossless PNG data in a PDF with no double compression. For printing and emailing web downloads.

HEIC

HEIC→PDF

Decode iPhone HEIC photos and embed the original JPEG data in a PDF, with EXIF orientation applied. For photo emails and print shops.

Convert to JPG10

View all →
WEBP

WebP→JPG

Re-encode WebP as JPG with transparency flattened to white, restoring readability in legacy browsers, office software, and photo apps.

AVIF

AVIF→JPG

Decode AVIF and re-encode as JPG with transparency flattened to white, resolving AV1 compatibility on older devices and office software.

HEIC

HEIC→JPG

Decode iPhone HEIC photos to JPG with automatic EXIF orientation correction, viewable on Windows, Android, and the web.

PNG

PNG→JPG

Re-encode PNG as JPG with transparency flattened to white, cutting size by an order of magnitude for photos and screenshots without alpha.

BMP

BMP→JPG

Re-encode uncompressed BMP bitmaps as JPG, cutting size by an order of magnitude for storage and transfer.

SVG

SVG→JPG

Rasterize SVG vector graphics to JPG with transparency flattened to white, for documents and legacy systems without vector support.

TIFF

TIFF→JPG

Re-encode print-grade TIFF as JPG, typically over 90% smaller, for proofing previews and transfer.

GIF

GIF→JPG

Extract the first frame of a GIF and encode it as JPG, removing the 256-color limit and cutting file size for still thumbnails and previews.

PDF

PDF→JPG

Render PDF pages to JPG at 144 DPI. Single pages download directly, multi-page documents ship as ZIP.

PSD

PSD→JPG

Decodes the PSD composite and encodes it as progressive JPEG (quality 1–100, transparent pixels flatten onto white or black) for sharing and web embeds.

Convert to PNG12

View all →
WEBP

WebP→PNG

Losslessly decode WebP to PNG with the alpha channel intact, ready for editing tools without generation loss.

AVIF

AVIF→PNG

Losslessly decode AVIF to PNG for editing and processing pipelines without a built-in AV1 decoder.

HEIC

HEIC→PNG

Decode HEIC photos to lossless PNG, preserving full capture detail for post-processing pipelines.

JPG

JPG→PNG

Decode JPG to lossless PNG so further editing and re-saving introduces no additional generation loss; file size increases accordingly.

GIF

GIF→PNG

Extract the first GIF frame as a lossless PNG for animation covers and static preview images.

BMP

BMP→PNG

Repackage BMP bitmaps as lossless PNG; DEFLATE compression reduces size by 30-50% with bit-identical pixels.

SVG

SVG→PNG

Rasterize SVG vector graphics to PNG with crisp edges and a preserved transparent background, for design handoff and documentation.

ICO

ICO→PNG

Extract the highest-resolution image from an ICO container as PNG with transparency kept, for editing and inspection.

TIFF

TIFF→PNG

Decode scanned TIFF to lossless PNG with bit-identical quality; DEFLATE compression reduces size further.

PDF

PDF→PNG

Render PDF pages to lossless PNG at 144 DPI. Sharp text without JPEG artifacts, multi-page documents ship as ZIP.

ICNS

ICNS→PNG

Extracts the highest-resolution PNG (1024px) from an ICNS container, reusing macOS icon resources on other platforms and in design files.

PSD

PSD→PNG

Decodes the PSD merged composite (Maximize Compatibility preview) and encodes it losslessly as PNG with alpha intact — no Photoshop required.

Convert to WebP9

View all →
JPG

JPG→WebP

Re-encode JPG as WebP for a 25-34% average size reduction at equivalent quality, cutting page transfer weight.

PNG

PNG→WebP

Re-encode PNG as WebP with transparency preserved; lossless mode averages 26% smaller, lossy mode further.

HEIC

HEIC→WebP

Decode HEIC photos and re-encode as WebP, balancing quality and size for web galleries and publishing.

GIF

GIF→WebP

Transcode GIF animation to WebP frame by frame with transparency kept, typically over 60% smaller.

BMP

BMP→WebP

Re-encode legacy BMP bitmaps as WebP, typically around 90% smaller, for modern web delivery.

TIFF

TIFF→WebP

Convert print-quality TIFF to compact WebP for web delivery, typically reducing file size by 80% or more while preserving transparency.

SVG

SVG→WebP

Rasterize SVG vector graphics into a compact WebP bitmap with the transparent background preserved, for email clients and CMS fields that reject SVG.

AVIF

AVIF→WebP

Transcode AVIF to WebP, keeping modern compression while extending browser support to Safari 14 and older Edge versions.

PDF

PDF→WebP

Render PDF pages to 144 DPI WebP images at roughly 70% of JPG size. Multi-page documents ship as ZIP. For web embeds and previews.

Convert to AVIF4

View all →
JPG

JPG→AVIF

Re-encode JPG as AVIF for roughly 50% smaller files at equivalent quality, targeting browsers with AV1 decoding.

PNG

PNG→AVIF

Re-encode PNG as AVIF with transparency preserved, for web graphics that need an alpha channel at lower transfer cost.

HEIC

HEIC→AVIF

Transcode iPhone HEIC photos to next-gen AVIF at about 50% of JPG size, with HDR and wide color gamut support.

WEBP

WebP→AVIF

Re-encode WebP as AVIF using AV1 intra-frame coding for further size reduction, targeting bandwidth-sensitive modern websites.

Convert to GIF10

View all →
WEBP

WebP→GIF

Transcode WebP animation frame by frame to GIF with looping preserved; color depth drops to 256 colors for email and legacy platforms.

JPG

JPG→GIF

Re-encode JPG photos into 256-color palette GIFs for legacy forums, email clients, and embedded systems that only accept GIF.

PNG

PNG→GIF

Map PNG images to a 256-color GIF palette with dithering and 1-bit transparency. For logos and stickers on legacy platforms.

MP4

MP4→GIF

Converts MP4 video to GIF with a two-pass palette (palettegen/paletteuse) and Bayer dithering, capped at 640px width and 20fps for chat stickers and docs.

WEBM

WebM→GIF

Converts WebM video to GIF with two-pass palette optimization for 256 colors, embedding motion where video is unsupported (email, legacy CMS).

MOV

MOV→GIF

Converts MOV (QuickTime) to GIF, turning iPhone screen recordings and short clips into chat- and forum-ready animation.

MKV

MKV→GIF

Turns MKV clips into GIF with a two-pass palette pipeline and Bayer dithering (640px, 20fps cap) for chat and doc embeds.

AVI

AVI→GIF

Transcodes an AVI clip into an animated GIF (dual-pass palette with Bayer dithering, 640px / 20fps cap) for embedding in forums and chats.

FLV

FLV→GIF

Transcodes an FLV clip into an animated GIF (dual-pass palette with Bayer dithering, 640px / 20fps cap) so legacy web clips embed anywhere.

WMV

WMV→GIF

Transcodes a WMV clip into an animated GIF (dual-pass palette with Bayer dithering, 640px / 20fps cap) for lightweight demo sharing.

Convert to TIFF3

View all →
JPG

JPG→TIFF

Wrap JPG images in the print-industry TIFF container without adding new compression loss, for prepress delivery, publishing, and archiving.

PNG

PNG→TIFF

Convert PNG to TIFF with the alpha channel and lossless quality intact, meeting print-shop and scan-archiving format requirements.

PDF

PDF→TIFF

Render PDF pages to TIFF images with a 300 DPI print-ready option. Multi-page ZIP output for print shops and publishing pipelines.

Convert to ICO2

View all →
PNG

PNG→ICO

Package a PNG into a standard ICO icon container with transparency fully preserved, scaled to 256px or smaller for favicons and Windows app icons.

JPG

JPG→ICO

Package a JPG image into an ICO icon file scaled to 256px or smaller, ready to use as a website favicon.

Convert to BMP2

View all →
JPG

JPG→BMP

Decode JPG to an uncompressed BMP bitmap with raw pixel data, for legacy Windows software and embedded devices that cannot decode JPEG.

PNG

PNG→BMP

Decode PNG to an uncompressed BMP bitmap for industrial software, legacy Windows programs, and microcontroller displays that only accept bitmaps.

Convert to MP316

View all →
WAV

WAV→MP3

Re-encodes WAV PCM to MP3 with adjustable 64–320kbps bitrate, shrinking files by roughly 90% for podcast distribution and mobile playback.

FLAC

FLAC→MP3

Decodes FLAC and re-encodes to MP3 at 44.1kHz, making lossless music libraries playable on devices without FLAC support.

OGG

OGG→MP3

Transcodes OGG Vorbis to MP3 for car stereos and legacy players that only recognize the MPEG audio layer.

M4A

M4A→MP3

Transcodes M4A (AAC) to MP3, stripping the Apple container for cross-platform sharing of iTunes and iPhone exports.

AAC

AAC→MP3

Re-wraps raw AAC streams as MP3 (MPEG-1 Layer III) for playback devices that do not accept ADTS streams.

OPUS

Opus→MP3

Transcodes Opus to MP3, moving voice messages and recorder files into universally playable environments.

MP4

MP4→MP3

Extracts the MP4 audio track and re-encodes it as MP3 (64–320kbps), discarding video frames entirely — for podcast clips, meeting recordings and ringtones.

MOV

MOV→MP3

Extracts audio from MOV (iPhone recordings, QuickTime captures) as MP3 at 64–320kbps, with mono and sample-rate options for voice.

WEBM

WebM→MP3

Decodes Opus/Vorbis audio from WebM and re-encodes as MP3 (64–320kbps), fixing playback of browser recordings on any device.

MKV

MKV→MP3

Demuxes MKV and decodes the first audio track (FLAC, DTS, AC-3) to MP3 at 64–320kbps; surround mixes downmix to stereo automatically.

AVI

AVI→MP3

Extracts the audio track of an AVI video as MP3 (64–320kbps); files without audio are reported upfront. For meeting and lecture recordings.

FLV

FLV→MP3

Extracts the audio track of an FLV video as MP3 (64–320kbps), for archiving sound from old courseware, concerts and recordings.

WMV

WMV→MP3

Extracts the audio track of a WMV file as MP3 (64–320kbps), for webinar and lecture audio extraction.

3GP

3GP→MP3

Extracts AMR audio from 3GP recordings as MP3 (64–320kbps), so old phone voice clips open in any music player.

VOB

VOB→MP3

Extracts the audio track of DVD VOB files (AC3/LPCM auto-decoded) as MP3, for concert and lecture discs.

MPG

MPG→MP3

Extracts the audio track of an MPG video as MP3 (64–320kbps), for legacy footage and performance clips.

Convert to WAV5

View all →
MP3

MP3→WAV

Decodes MP3 to 16-bit WAV PCM, expanding to linear samples for import into Audacity, Premiere and other editors.

FLAC

FLAC→WAV

Decodes FLAC to WAV PCM at the original sample rate and bit depth for studio post-processing and CD mastering.

OGG

OGG→WAV

Decodes OGG Vorbis to WAV PCM, bringing game audio and web sounds into professional editing pipelines.

M4A

M4A→WAV

Decodes M4A to WAV PCM, moving iPhone voice memos into Windows-based editing software.

MP4

MP4→WAV

Decodes the MP4 audio track to 16-bit PCM WAV with no further lossy pass, ready for DAW editing in Audacity or Premiere.

Convert to FLAC2

View all →
WAV

WAV→FLAC

Encodes WAV PCM to FLAC lossless compression, cutting size by 40–60% with bit-identical decoding for long-term music archiving.

MP3

MP3→FLAC

Re-wraps decoded MP3 in a FLAC container without adding new lossy compression, unifying library format and metadata handling.

Convert to OGG3

View all →
MP3

MP3→OGG

Transcodes MP3 to OGG Vorbis, the royalty-free format preferred by game engines like Unity and Godot and open-source projects.

WAV

WAV→OGG

Encodes WAV PCM to OGG Vorbis (64–256kbps) for lossy distribution of web sound effects and game assets.

MP4

MP4→OGG

Extracts the MP4 audio track as Vorbis OGG (VBR quality 2–8) for Godot, Unity and HTML5 audio fallback.

Convert to M4A3

View all →
MP3

MP3→M4A

Transcodes MP3 to M4A (AAC up to 256kbps) in an MPEG-4 container for iTunes libraries and ringtone creation.

WAV

WAV→M4A

Encodes WAV PCM to M4A AAC, cutting size by about 80% for distributing recordings and spoken content on iPhone and iPad.

MP4

MP4→M4A

Extracts the MP4 audio track as AAC in an M4A container (64–256kbps, faststart) for native playback across the Apple ecosystem.

Convert to Opus2

View all →
MP3

MP3→Opus

Transcodes MP3 to Opus (32–256kbps), the modern codec for voice calls and low-bitrate streaming.

WAV

WAV→Opus

Encodes WAV PCM to Opus, which keeps speech clearer than MP3 at low bitrates for podcast hosting and voice messaging.

Convert to AAC2

View all →
MP3

MP3→AAC

Transcodes MP3 to raw AAC (ADTS) for broadcast streams, HLS segments and embedded device audio sources.

MP4

MP4→AAC

Extracts the MP4 audio track as a raw AAC stream (ADTS framing, 64–256kbps) for HLS broadcast chains and embedded players.

Convert to MP49

View all →
GIF

GIF→MP4

Encodes GIF animation to MP4 (H.264 + yuv420p), cutting size by roughly 80–95% for web embeds and social uploads.

WEBM

WebM→MP4

Transcodes WebM to MP4 (H.264 + faststart) for compatibility with Safari, iOS and players without VP9 support.

MKV

MKV→MP4

Re-encodes MKV as H.264 + AAC MP4 (yuv420p, faststart) for native playback on smart TVs, phones and browsers.

AVI

AVI→MP4

Re-encodes AVI from dashcams, DVRs and old cameras as H.264 + AAC MP4 with faststart, restoring playback on phones, TVs and browsers.

FLV

FLV→MP4

Re-encodes Flash-era FLV courseware and web videos as H.264 + AAC MP4 with faststart — no Flash plugin needed on any platform.

WMV

WMV→MP4

Re-encodes WMV from Windows recordings as H.264 + AAC MP4 with faststart, fixing playback on macOS, iPhone and TVs.

3GP

3GP→MP4

Re-encodes 3GP clips (H.263/AMR) from early phones and MMS as H.264 + AAC MP4, making legacy mobile footage playable today.

VOB

VOB→MP4

Re-encodes DVD VIDEO_TS VOB files (MPEG-2) as H.264 + AAC MP4, cutting size by 60–80% at equal perceived quality.

MPG

MPG→MP4

Re-encodes MPG (MPEG-1/2) from VCDs, DV cameras and early downloads as H.264 + AAC MP4 with faststart, 60–80% smaller.

Convert to WebM3

View all →
GIF

GIF→WebM

Encodes GIF animation to WebM (VP9), cutting size by about 85% for muted looping animation in modern browsers.

MP4

MP4→WebM

Transcodes MP4 to WebM (VP9 with constant-quality CRF) as a royalty-free, smaller alternative source for web video.

MKV

MKV→WebM

Re-encodes MKV as VP9 + Opus WebM (constant-quality CRF) for royalty-free HTML5 video delivery.

Convert to MKV2

View all →
MP4

MP4→MKV

Re-encodes MP4 as H.264 + AAC inside the Matroska container for Jellyfin, Plex and Kodi media libraries.

WEBM

WebM→MKV

Re-encodes WebM as H.264 + AAC inside Matroska, fitting media-server libraries and desktop editing workflows.

Convert to AVI1

MP4

MP4→AVI

Re-encodes MP4 as MPEG-4 video + MP3 audio in an AVI container for legacy DVD players, car head units and old editors.

Convert to SVG3

View all →
PNG

PNG→SVG

Traces PNG bitmaps into SVG vector paths (vtracer color-stacked mode) with spline fitting, scaling logos and illustrations to any size.

JPG

JPG→SVG

Traces JPG photos into SVG vector graphics with layered color regions for infinite scaling and re-editing of poster elements.

WEBP

WebP→SVG

Traces WebP bitmaps into SVG vector paths, turning modern web images into editable vector assets.

Convert to XLSX4

View all →
CSV

CSV→XLSX

Wraps CSV into an XLSX workbook with numeric and boolean type inference, handing logs and data exports to Excel users.

JSON

JSON→XLSX

Generates an XLSX workbook from JSON object arrays with key names as headers, delivering API responses as editable reports.

ODS

ODS→XLSX

Converts ODS to XLSX, handing LibreOffice spreadsheets to Microsoft Excel users for further editing.

XLS

XLS→XLSX

Upgrades legacy XLS (BIFF8) to XLSX (OOXML), migrating pre-2003 spreadsheets into modern Office environments.

Convert to CSV4

View all →
JSON

JSON→CSV

Converts JSON object arrays to CSV (RFC 4180, quote-escaped with CRLF), inlining nested values as JSON strings for Excel import and data analysis.

YAML

YAML→CSV

Converts YAML object arrays to CSV, exporting structured lists from configuration files into Excel-readable tables.

XLSX

XLSX→CSV

Extracts the first XLSX worksheet to UTF-8 CSV with cached formula values, importing spreadsheets into databases and scripts.

XLS

XLS→CSV

Extracts the first worksheet of legacy XLS files to CSV, feeding exports from legacy systems into modern data pipelines.

Convert to JSON5

View all →
YAML

YAML→JSON

Parses YAML to JSON, resolving anchors and multi-line strings, handing configuration to APIs and programs that only accept JSON.

XML

XML→JSON

Parses XML to JSON with attributes under the @_ prefix and text nodes preserved, feeding SOAP/RSS responses into modern frontends.

TOML

TOML→JSON

Parses TOML to JSON preserving dates and arrays, handing Rust/Python project config to JavaScript tooling.

CSV

CSV→JSON

Parses CSV to JSON object arrays using the header row as keys with numeric restoration, feeding spreadsheet exports into web APIs and frontends.

XLSX

XLSX→JSON

Extracts the first XLSX worksheet to JSON object arrays with headers as keys and cached formula values, connecting spreadsheets to web apps.

Convert to ODS1

XLSX

XLSX→ODS

Converts XLSX to ODS (OpenDocument Spreadsheet) for native collaboration in LibreOffice and open-source office suites.

Convert to YAML2

View all →
JSON

JSON→YAML

Converts JSON to YAML 1.2 with indentation instead of braces for Kubernetes, Docker Compose and CI configuration files.

CSV

CSV→YAML

Parses CSV to YAML object arrays with the header row as keys, migrating tabular data into config files and static-site data sources.

Convert to XML1

JSON

JSON→XML

Converts JSON to XML with an automatic single root element and repeated child nodes for arrays, integrating with SOAP and legacy enterprise interfaces.

Convert to TOML1

JSON

JSON→TOML

Converts JSON to TOML for Rust/Python ecosystem config files such as Cargo.toml, pyproject.toml and Hugo settings.

Convert to HTML3

View all →
MD

Markdown→HTML

Renders Markdown to a complete HTML5 document (GFM tables and strikethrough, inline typography) for publishing blog and doc pages.

DOCX

DOCX→HTML

Maps Word headings, lists and tables to semantic HTML tags, wrapped in a complete styled HTML5 document that stays hand-editable.

RTF

RTF→HTML

Rebuilds RTF as a complete HTML5 document — paragraphs from \par marks, bold/italic/underline kept as semantic tags, ready to publish.

Convert to Markdown2

View all →
HTML

HTML→Markdown

Extracts HTML to Markdown, dropping scripts and styles while keeping headings, lists and tables for migration to static site generators.

DOCX

DOCX→Markdown

Converts DOCX via a semantic HTML intermediate to Markdown (GFM tables, ATX headings) for docs-as-code migration.

Convert to ZIP8

View all →
7Z

7Z→ZIP

Unpacks 7z and repacks as ZIP (DEFLATE) for direct extraction on Windows/macOS without installing 7-Zip.

TAR

TAR→ZIP

Unpacks TAR and repacks as ZIP, handing Linux archives to Windows users for double-click extraction.

RAR

RAR→ZIP

Unpacks RAR in a WebAssembly sandbox and repacks as ZIP (DEFLATE level 9, 256MB/1000-file safety ceilings) that opens natively everywhere.

TGZ

TGZ→ZIP

Strips the gzip layer, unpacks the TAR and repacks as ZIP (DEFLATE 9); the .tar.gz double extension is detected automatically.

ISO

ISO→ZIP

Reads the ISO 9660 directory tree without mounting and repacks it as ZIP (DEFLATE level 9, 256MB safety ceiling) — opens natively everywhere.

CAB

CAB→ZIP

Unpacks Microsoft CAB installers (MSZIP/LZX) and repacks contents as ZIP, so macOS and Linux can extract drivers and components.

DEB

DEB→ZIP

Unpacks a Debian DEB and descends into the data payload automatically — the ZIP holds the real software files, not an intermediate tar.

RPM

RPM→ZIP

Unpacks an RPM and descends into its cpio payload automatically (the rpm2cpio equivalent) — the ZIP holds the real software files.

Convert to 7Z3

View all →
ZIP

ZIP→7Z

Repacks ZIP into 7z (LZMA compression), typically shrinking size another 10–30% for long-term archiving and bandwidth-limited distribution.

TAR

TAR→7Z

Repacks TAR into 7z (LZMA), adding a compression layer to plain archives to reduce server backup storage.

TGZ

TGZ→7Z

Unpacks .tar.gz and recompresses as 7Z with LZMA (typically 10–30% smaller than gzip), preserving the directory structure.

Convert to TAR3

View all →
ZIP

ZIP→TAR

Repacks ZIP into a TAR archive preserving directory structure for Linux server deployment and Docker build contexts.

7Z

7Z→TAR

Unpacks 7z and repacks as TAR, migrating high-compression archives to the Unix-standard packaging format.

TGZ

TGZ→TAR

Strips the gzip wrapper from .tar.gz, yielding the plain TAR container with file contents byte-identical — for incremental backups and installers.

Convert to TGZ3

ZIP

ZIP→TGZ

Unpacks ZIP, re-archives as TAR and compresses with gzip level 9 into .tar.gz for Linux servers and deployment pipelines.

7Z

7Z→TGZ

Unpacks 7Z, re-archives as TAR and compresses with gzip level 9 — for minimal Linux images where tar -xzf is available but p7zip is not.

TAR

TAR→TGZ

Compresses a plain TAR with gzip level 9 into .tar.gz (text and code typically shrink 60–80%); file contents stay byte-identical.

Convert to WOFF22

View all →
TTF

TTF→WOFF2

Compresses TTF to WOFF2 (Brotli font compression), cutting size by about 50% for self-hosted web @font-face fonts.

OTF

OTF→WOFF2

Compresses OTF (CFF outlines) to WOFF2, publishing desktop fonts as web fonts and reducing first-load size.

Convert to TTF1

WOFF2

WOFF2→TTF

Decompresses WOFF2 back to TTF, installing web fonts on desktop systems or importing them into font editors.

Convert to ICNS1

PNG

PNG→ICNS

Packs PNG into ICNS with seven resolutions from 16 to 1024px and transparency preserved, for macOS app icons and DMG installers.

Convert to TXT5

View all →
EPUB

EPUB→TXT

Extracts all chapters as plain text in EPUB spine reading order (markup and navigation pages stripped) for full-text search, corpora and text-to-speech sources.

PDF

PDF→TXT

Extracts the PDF text layer via MuPDF structured text (line and paragraph layout preserved, up to 200 pages); scanned PDFs without a text layer are reported.

DOCX

DOCX→TXT

Parses DOCX OOXML directly and extracts paragraph text as UTF-8 plain text — no Office needed — for search indexing and content migration.

RTF

RTF→TXT

Parses RTF with a control-word state machine, skips font/style metadata, decodes \uN escapes for CJK text, outputs clean UTF-8 plain text.

ODT

ODT→TXT

Parses content.xml inside the ODT directly and extracts paragraphs, headings and list items in order as UTF-8 text — no office suite needed.

Convert Subtitles12

View all →
SRT

SRT→VTT

Convert SRT to WebVTT with dot-format timestamps, matching the native subtitle track of HTML5 video.

VTT

VTT→SRT

Convert WebVTT to SRT, stripping positioning and style tags to restore broad player and editor compatibility.

SRT

SRT→ASS

Convert SRT to ASS with a default style layer, unlocking font, color, positioning, and effects control.

ASS

ASS→SRT

Convert ASS to SRT, stripping style and effect tags to keep only timing and dialogue text for universal compatibility.

VTT

VTT→ASS

Convert WebVTT to ASS, keeping the timeline and mapping basic styling, for professional subtitle layout work.

ASS

ASS→VTT

Convert ASS to WebVTT, keeping timing and dialogue with basic styles mapped to VTT tags for web video playback.

SRT

SRT→SBV

Convert SRT subtitles to YouTube Studio native SBV upload format with exact cue timing preserved.

SBV

SBV→SRT

Convert YouTube SBV subtitles to universal SRT for VLC, Premiere, Aegisub, and translation tools.

SRT

SRT→LRC

Convert SRT subtitles to LRC lyrics format. Each cue maps to a [mm:ss.xx] line timestamp.

LRC

LRC→SRT

Convert LRC lyrics to SRT subtitles. Each line ends when the next begins, ready for video editors.

MKV

MKV→SRT

Demuxes MKV and extracts the first subtitle track as standalone SRT — no video decode, no OCR, bit-exact timing; files without a track are reported.

MP4

MP4→SRT

Demuxes MP4 and extracts embedded mov_text subtitles as SRT with original timing; burned-in (hardcoded) subtitles cannot be extracted and are reported.

Subtitles to Plain Text5

View all →
SRT

SRT→TXT

Strip sequence numbers and timecodes from SRT subtitles and output dialogue text only, with consecutive duplicates removed, for transcripts and translation prep.

VTT

VTT→TXT

Strip timecodes, positioning, and style tags from WebVTT files, leaving clean dialogue text for transcripts and content indexing.

ASS

ASS→TXT

Strip ASS timestamps, style definitions, and override tags, leaving only dialogue lines for transcripts and translation workflows.

SBV

SBV→TXT

Strip YouTube SBV timestamp lines and control codes, outputting plain dialogue text for transcripts and quoting.

LRC

LRC→TXT

Remove timestamps and metadata tags from LRC files, leaving only lyric lines for lyric sheets and translation.

Image Compression5

View all →
JPG

Compress JPG

Re-encode JPG photos with MozJPEG at adjustable quality. Typically 30-60% smaller at quality 80, output stays standard JPG.

PNG

Compress PNG

Compress PNG with palette quantization and maximum DEFLATE. Screenshots and graphics shrink 50-70%, transparency preserved.

WEBP

Compress WebP

Re-encode WebP at adjustable quality to cut delivery weight. Transparency and animation frames preserved.

AVIF

Compress AVIF

Re-run AV1 encoding at adjustable quality to shrink AVIF files exported at near-lossless settings.

SVG

Compress SVG

Losslessly minify SVG markup by stripping editor metadata, comments, and redundant precision. Typically 30%–70% smaller with identical rendering.

Utility Tools9

PDF

Compress PDF

Re-renders every page as an adjustable-density JPEG and rebuilds the document, cutting size by 50-90% while rasterizing the text layer. Suited for optimizing scanned and image-heavy PDFs for delivery.

ICO

Favicon Generator

Upload any image and get a complete favicon package: multi-resolution ICO, platform PNGs, Apple touch icon, and web manifest in one ZIP.

IMG

Resize Image

Resize images to exact pixel dimensions. Aspect ratio and original format preserved; downscaling typically cuts file size by 80% or more.

Subtitle Time Shift

Shift all subtitle timestamps by a given offset, positive or negative, with decimal-second precision. Out-of-range cues are clamped or dropped; output keeps the original format.

Subtitle Trim

Keep only the cues within a given time range and rebase timestamps to zero, ready to pair with the trimmed video clip. Output keeps the original format.

Bilingual Subtitle Merge

Match the secondary subtitle to the primary timeline by maximum time overlap and append it as a second line, producing a bilingual subtitle file in SRT, VTT, or ASS.

PDF Merge

Joins two PDFs into one file in upload order (lossless page-level copy via pdf-lib, no re-rendering, text stays selectable), up to 200 pages combined.

PDF Split

Extracts a page selection (e.g. 1-5 or 1,3,5-7) from a PDF into a new file — lossless page copy, text and vectors stay intact.

Images to PDF Merger

Combine 2-30 images into a single PDF in your chosen order, one page per image. JPG/PNG data embeds losslessly with automatic EXIF orientation correction. Suited for receipt archiving, ID document submission and print layouts.

Frequently Asked Questions

How does OKfmt charge?

All 188 tools are free, with no paid tiers or usage caps. The limit is 50MB per file and 30 files per batch.

What happens to uploaded files?

Files are uploaded over HTTPS, converted on the server, and deleted immediately afterwards. They are never stored, indexed, or used for any other purpose.

Which formats are supported?

Images: WebP, AVIF, HEIC, JPG, PNG, GIF, BMP, SVG, ICO, TIFF conversion and same-format compression. Documents: two-way image-PDF conversion. Subtitles: SRT, VTT, ASS, SBV, LRC conversion and plain-text extraction.

What is WebP format?

WebP is an image format released by Google in 2010, supporting lossy and lossless compression, transparency, and animation. Official benchmarks: lossless WebP is 26% smaller than PNG; lossy WebP is 25-34% smaller than JPG at equivalent quality.

What is AVIF format?

AVIF is an image format based on AV1 intra-frame coding, finalized in 2019. It is about 50% smaller than JPG at equivalent quality, with transparency and HDR support. Chrome 85+, Firefox 93+, and Safari 16.4+ support it natively.

Why can't I open HEIC files?

HEIC is the default iOS camera format, based on HEVC coding. Windows and most Android apps ship no decoder for it. Converting HEIC to JPG makes the photos viewable on any device.