ChangeThisFile vs Foxit Online Tools: File Converter vs PDF Suite

Foxit is primarily known for its PDF reader and enterprise PDF management platform — the online conversion tools are a convenience addition, not the core product. If you've landed here from a search for an online file converter, Foxit's web tools are functional but limited in scope compared to dedicated converters.

ChangeThisFile is a conversion-first tool: 690 routes, client-side processing for common formats so your files never leave your device, and a developer API with a free tier. This comparison focuses on where each tool is the right fit.

Quick verdict

For PDF editing, redaction, and enterprise document workflows: Foxit. Their full platform is a serious PDF editor used by enterprises and governments.

For free online file conversion (images, video, audio, ebooks, archives): ChangeThisFile. Foxit's online tools are primarily PDF-focused.

For developer API access: ChangeThisFile. Foxit's online tools don't offer a free REST API for external integration.

For privacy-sensitive files: ChangeThisFile — 161 routes process files entirely client-side with no upload.

Pricing comparison

Foxit's enterprise SDK and API exist but are aimed at enterprise software developers integrating PDF functionality — not general-purpose file conversion at a free/low tier. ChangeThisFile's API is for anyone who needs to convert files programmatically, starting free.

Feature comparison

Privacy and data handling

Foxit's online tools process files server-side. Files are uploaded to Foxit's infrastructure for conversion. For enterprise users, Foxit offers on-premise options through their full platform.

ChangeThisFile's client-side routes process files entirely in your browser. For images (JPG, PNG, WebP, GIF, BMP, ICO, AVIF, SVG, TIFF, HEIC, PSD), data files (CSV, JSON, YAML, TOML, XML, TSV), spreadsheets (XLSX), DOCX→HTML, HTML↔Markdown, image-to-PDF, and fonts: your file is never uploaded. The conversion happens locally in JavaScript.

For server-side routes (video, audio, complex documents, archives), ChangeThisFile uploads over HTTPS and auto-deletes after conversion.

API and developer experience

Foxit does have developer-facing products — the Foxit PDF SDK and eSign API — but these are enterprise products with enterprise pricing, not accessible as a free REST API for general file conversion tasks.

ChangeThisFile's conversion API is straightforward. No SDK install, no client library — just a POST with your file and the target format:

curl -X POST https://changethisfile.com/v1/convert \
  -H "Authorization: Bearer ctf_sk_your_key" \
  -F "file=@presentation.pptx" \
  -F "target=pdf" \
  --output presentation.pdf

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.

Format coverage

Foxit's online tools center on PDF operations: convert Office documents to PDF and back, compress PDFs, merge, split, and sign. The format catalog is narrower than a general-purpose converter.

ChangeThisFile covers 690 specific conversion routes: all major image formats (including HEIC, AVIF, PSD, RAW), documents (PDF, DOCX, ODT, RTF, HTML), spreadsheets (XLSX, CSV, TSV, JSON), video (MP4, MKV, WebM, AVI, MOV, FLV, WMV), audio (MP3, WAV, FLAC, AAC, M4A), ebooks (EPUB, MOBI, AZW3, FB2, CBR/CBZ), archives (ZIP, RAR, 7Z, TAR and variants), and fonts (TTF, OTF, WOFF, WOFF2).

When to choose which

Foxit is a legitimate enterprise PDF platform — if you're evaluating PDF editors, it belongs on the list alongside Adobe Acrobat. But for general file conversion, a free web tool, or developer API access, ChangeThisFile is the more practical choice. Start with the free API tier — 1,000 conversions/month, no commitment.