ChangeThisFile vs Online-Convert: Which Should You Use?

Online-Convert.com has been around for years and built a reputation for device-specific presets — you can convert a video "for Kindle" or a document "for iPhone" with optimized settings baked in. That's a genuine convenience for non-technical users who don't know what codec settings they need.

ChangeThisFile focuses on a different set of strengths: a clean, ad-free interface, client-side processing for privacy-sensitive formats, and a free API tier that works without a credit card. This comparison covers both tools honestly.

Quick verdict

For everyday conversions without ads: ChangeThisFile. Clean interface, no pop-overs, no daily limits.

For device-optimized presets (Kindle, iPhone, etc.): Online-Convert.com has a specific advantage here with built-in presets tailored to popular devices.

For privacy: ChangeThisFile. Client-side routes for images, data files, and fonts never upload to any server.

For free API access: ChangeThisFile. Free tier with 1,000 conversions/month and no card required.

Pricing comparison

Online-Convert.com's business model is based on subscriptions that remove ads and increase conversion limits. ChangeThisFile has no ads at any tier.

Feature comparison

Format coverage

Online-Convert.com supports a wide range of formats across image, video, audio, document, ebook, and hash/checksum tools. Their device-preset system covers a long list of popular devices — a useful shortcut for users who don't know which settings to use for a specific target device.

ChangeThisFile covers 690 routes across 82 formats. Client-side image routes (JPG, PNG, WebP, HEIC, AVIF, GIF, BMP, ICO, SVG) use the browser's Canvas API. Server-side routes use FFmpeg for video/audio, LibreOffice for documents, Calibre for ebooks, and 7-Zip for archives.

For mainstream formats, both tools have strong coverage. Online-Convert's device preset library is a differentiated advantage for specific workflows (ebook reader preparation, mobile video, etc.).

Privacy and data handling

Online-Convert.com is server-side only. All files are uploaded for processing. Their privacy policy covers deletion timelines.

ChangeThisFile converts 161 routes in the browser without any upload. For all major image formats, common data formats (CSV, JSON, YAML, XML, TOML, TSV), markup conversions (HTML↔Markdown, DOCX→HTML), PSD, HEIC, and font formats, your file never leaves your device.

For server-side routes (video, audio, complex documents, archives), ChangeThisFile uploads over encrypted HTTPS and auto-deletes files after conversion — behavior similar to Online-Convert.com for those formats.

API and developer experience

Online-Convert.com provides a developer API on paid plans. Their API supports conversion with format-specific settings and URL-based file import (convert a file from a URL without uploading).

ChangeThisFile's API is simpler and free to start:

curl -X POST https://changethisfile.com/v1/convert \
  -H "Authorization: Bearer ctf_sk_your_key" \
  -F "file=@video.avi" \
  -F "source=avi" \
  -F "target=mp4" \
  --output video.mp4

Get a key at changethisfile.com/v1/keys/free — one HTTP request, no account, no card. The response is the converted file directly.

When to choose which

Online-Convert.com's device presets are worth knowing about if you regularly prepare files for specific devices. For everything else — clean UI, client-side privacy, free API access — ChangeThisFile is the simpler, no-ads alternative. Free API key →