OKfmt

All Tools188

Convert to PDF5

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Convert to JPG10

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Convert to PNG12

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WEBP

WebPโ†’PNG

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

AVIF

AVIFโ†’PNG

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

HEIC

HEICโ†’PNG

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

JPG

JPGโ†’PNG

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

GIF

GIFโ†’PNG

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

BMP

BMPโ†’PNG

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

SVG

SVGโ†’PNG

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

ICO

ICOโ†’PNG

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

TIFF

TIFFโ†’PNG

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

PDF

PDFโ†’PNG

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

ICNS

ICNSโ†’PNG

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

PSD

PSDโ†’PNG

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

Convert to WebP9

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Convert to AVIF4

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Convert to GIF10

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Convert to TIFF3

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Convert to ICO2

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Convert to BMP2

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Convert to MP316

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WAV

WAVโ†’MP3

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

FLAC

FLACโ†’MP3

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

OGG

OGGโ†’MP3

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

M4A

M4Aโ†’MP3

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

AAC

AACโ†’MP3

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

OPUS

Opusโ†’MP3

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

MP4

MP4โ†’MP3

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

MOV

MOVโ†’MP3

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

WEBM

WebMโ†’MP3

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

MKV

MKVโ†’MP3

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

AVI

AVIโ†’MP3

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

FLV

FLVโ†’MP3

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

WMV

WMVโ†’MP3

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

3GP

3GPโ†’MP3

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

VOB

VOBโ†’MP3

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

MPG

MPGโ†’MP3

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

Convert to WAV5

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Convert to FLAC2

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Convert to OGG3

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Convert to M4A3

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Convert to Opus2

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Convert to AAC2

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Convert to MP49

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Convert to WebM3

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Convert to MKV2

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Convert to AVI1

Convert to SVG3

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Convert to XLSX4

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Convert to CSV4

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Convert to JSON5

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Convert to ODS1

Convert to YAML2

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Convert to XML1

Convert to TOML1

Convert to HTML3

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Convert to Markdown2

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Convert to ZIP8

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Convert to 7Z3

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Convert to TAR3

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Convert to TGZ3

Convert to WOFF22

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Convert to TTF1

Convert to ICNS1

Convert to TXT5

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Convert Subtitles12

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SRT

SRTโ†’VTT

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

VTT

VTTโ†’SRT

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

SRT

SRTโ†’ASS

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

ASS

ASSโ†’SRT

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

VTT

VTTโ†’ASS

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

ASS

ASSโ†’VTT

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

SRT

SRTโ†’SBV

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

SBV

SBVโ†’SRT

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

SRT

SRTโ†’LRC

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

LRC

LRCโ†’SRT

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

MKV

MKVโ†’SRT

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

MP4

MP4โ†’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

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Image Compression5

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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 โ€” 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.