Alternative to Smallpdf: Comparison Guide for PDF and Image Interconversion Tools
This article compares the limitations of Smallpdf's free tier with OKfmt. OKfmt supports free bidirectional conversion, with a 50MB limit per file and support for up to 30 files in batch conversion.
อัปเดตเมื่อ 2026-08-11
Current Limitations of Smallpdf Free Tier
Smallpdf's free tier has a daily operation limit. The specific quota is subject to the latest official announcement on Smallpdf's website. Smallpdf adopts a service model of free tier plus paid subscription, covering most basic PDF processing needs.
Smallpdf supports multiple PDF processing functions including PDF compression, merging, splitting, and editing, which can meet users' PDF processing requirements in various scenarios. For users who only need to interconvert between images and PDF, the daily operation limit may affect the user experience.
Positioning Differences Between OKfmt and Smallpdf
OKfmt does not provide PDF compression, merging, splitting, or editing functions, and only focuses on bidirectional format conversion between images and PDF. OKfmt's rules for this specific use case differ significantly from those of Smallpdf's free tier.
OKfmt supports completely free bidirectional conversion between images and PDF, with a maximum single file size of 50MB, a maximum of 30 files per batch conversion, no user registration required throughout the process, and no advertisements displayed on the interface.
| Comparison Item | Smallpdf | OKfmt Image-PDF Interconversion |
|---|---|---|
| Core Function | Full-category PDF processing | Focus on bidirectional image and PDF conversion |
| Image to PDF / PDF to Image | Counted towards daily operation quota | Completely free |
| Single file size limit | Subject to official website announcement | 50MB |
| Number of files in batch conversion | Subject to official website announcement | 30 files |
| Registration requirement | Registration required for free tier | No registration required |
| Advertisement display | Contains advertisements | No advertisements in interface |
Parameter Description for PDF to Image Function
OKfmt's PDF to Image tool provides three selectable output DPI settings: 96DPI, 144DPI, and 300DPI. Users can select the corresponding setting according to their usage scenario. 96DPI is suitable for on-screen online browsing, and 300DPI meets the requirements for printing use.
When OKfmt processes multi-page PDF to image conversion, all output images will be packaged into a single ZIP compressed archive for download, eliminating the need for users to save images page by page manually and reducing manual operation steps.
Comparison of Privacy Processing Mechanisms
Smallpdf's privacy policy has clear provisions on file storage duration. For specific details, please refer to the privacy statement page on Smallpdf's official website. Users can obtain the latest file processing privacy rules on that page.
When OKfmt processes files uploaded by users, all conversion operations are completed locally in the user's browser. Immediately after conversion completes, the browser deletes the user's uploaded source files and generated output files. The platform does not store any user file content.
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Can scanned PDF files be converted to images in bulk?
OKfmt supports batch conversion of scanned PDF to image, processing up to 30 files per batch with each file no larger than 50MB. You can select the output DPI setting yourself, and the converted files will be packaged into a ZIP archive for download.
Can multiple images be packed and converted into a single PDF?
OKfmt's image to PDF tool supports batch processing, allowing up to 30 images to be uploaded per batch with each image no larger than 50MB. It can merge all images and output a single PDF file, and the conversion is completely free.
Does OKfmt retain the files I uploaded?
All conversion operations of OKfmt are completed locally in the user's browser. Source files and output files are deleted immediately after conversion is complete. The platform server does not store any user-uploaded files, and data is only retained on the user's local device.