FileConvertPro is a web-based file converter covering common format pairs across documents, images, and audio. It's functional for quick conversions and doesn't require a signup for basic use.
ChangeThisFile offers more routes, runs many conversions client-side so files never leave your browser, and provides a developer API with 1,000 free calls/month. This comparison covers the meaningful differences.
Quick verdict
For quick web conversions: Both work. ChangeThisFile is ad-free and covers more formats.
For privacy-sensitive files: ChangeThisFile — images, data files, and fonts process in your browser without uploading.
For developer API access: ChangeThisFile only. FileConvertPro has no API.
For maximum format coverage: ChangeThisFile — 690 routes including video, audio, archives, ebooks, and fonts that FileConvertPro may not cover.
Pricing comparison
| Plan | ChangeThisFile | FileConvertPro |
|---|---|---|
| Free web tool | Yes, unlimited, no signup | Yes (with limitations) |
| Ads | None | Yes |
| File size limit | Device RAM (client-side) / 50MB (API) | Varies by plan |
| Free API tier | 1,000 conversions/month, no card | None |
| Paid API | $29/$99/$499/$1,999/mo | Not available |
| Email signup required? | No | Some features may require it |
Feature comparison
| Feature | ChangeThisFile | FileConvertPro |
|---|---|---|
| No signup for web use | Yes | Varies |
| Ad-free | Yes | No |
| Client-side conversions | Yes — 161 routes in browser | No |
| Developer API | Yes (free + paid tiers) | No |
| Video conversions | Yes (FFmpeg) | Limited |
| Archive conversions | Yes (7-Zip, full cross-format) | Limited or none |
| Ebook conversions | Yes (Calibre) | Limited |
| Font conversions | Yes (client-side) | No |
| Conversion routes | 690 | ~100–200 (estimated) |
Privacy and data handling
FileConvertPro processes all conversions server-side — files are uploaded to their servers, converted, and returned. Standard web converter privacy model with no claim of client-side processing.
ChangeThisFile's client-side routes never upload files at all. Images (JPG, PNG, WebP, GIF, BMP, ICO, AVIF, SVG, TIFF, HEIC, PSD), data files (CSV, JSON, YAML, TOML, XML, TSV), spreadsheets (XLSX), document conversions (DOCX→HTML, HTML↔Markdown), image-to-PDF, and fonts all run in your browser using JavaScript. Nothing is sent over the network for those formats.
For server-side routes (video, audio, complex documents, archives), ChangeThisFile uploads over HTTPS and auto-deletes after conversion.
API and developer experience
FileConvertPro has no developer API. Automating conversions would require web scraping — impractical and unsupported.
ChangeThisFile's API works directly from any HTTP client with no SDK to install:
curl -X POST https://changethisfile.com/v1/convert \
-H "Authorization: Bearer ctf_sk_your_key" \
-F "file=@data.csv" \
-F "target=json" \
--output data.json
Source format is auto-detected from the filename. Free tier: 1,000 calls/month, no credit card. Get a key at changethisfile.com/v1/keys/free. Paid tiers start at $29/mo for 10,000 conversions/month.
Format coverage
FileConvertPro handles common document and image conversions reliably. Its format catalog is adequate for everyday use but narrower than dedicated multi-format converters.
ChangeThisFile's 690 routes cover the full range: all major image formats (including HEIC, AVIF, PSD, RAW), documents (PDF, DOCX, ODT, RTF), spreadsheets (XLSX, CSV, TSV, JSON, YAML), video (MP4, MKV, WebM, AVI, MOV, FLV, WMV), audio (MP3, WAV, FLAC, AAC, M4A, OGG), ebooks (EPUB, MOBI, AZW3, FB2, CBR/CBZ), archives (ZIP, RAR, 7Z, TAR and variants), and fonts (TTF, OTF, WOFF, WOFF2).
When to choose which
| Use case | Recommended |
|---|---|
| Quick web conversion of common formats | ChangeThisFile (ad-free, more routes) |
| Privacy-sensitive images or data files | ChangeThisFile (client-side) |
| Developer API integration | ChangeThisFile |
| Free API with no credit card | ChangeThisFile |
| Video, audio, ebook, or archive conversion | ChangeThisFile |
FileConvertPro covers the basics for casual users, but ChangeThisFile is better in nearly every dimension that matters: more format coverage, client-side privacy for sensitive files, an ad-free experience, and a developer API. ChangeThisFile is free to use and takes no signup — give it a try on your next conversion.