Mux is exceptional video infrastructure. It encodes your uploads into adaptive bitrate streams (HLS/DASH), hosts them on a CDN, handles DRM, and gives you a polished player SDK. It's the right tool when your product is video streaming.
ChangeThisFile solves a narrower problem: converting a file from one format to another. MP4 to WebM for browser compatibility. MOV to MP4 because your upload pipeline expects it. MP4 to MP3 to extract the audio track. One POST request, one converted file back.
This comparison helps you understand what each tool does well — and where they genuinely don't compete.
Quick verdict
Need adaptive streaming (HLS/DASH), player embed, or CDN video hosting? Use Mux. ChangeThisFile doesn't do any of this.
Need to convert a video file to a different format or extract audio? Use ChangeThisFile. Mux doesn't expose raw format conversion — it encodes to its own streaming format.
Need both? Use ChangeThisFile to prep files (e.g., normalize to MP4 H.264 before upload) then send to Mux for streaming. They compose well.
On a budget or prototyping? ChangeThisFile's free tier (1,000 conversions/month, no card required) costs nothing. Mux has no free tier — billing starts from first upload.
Pricing comparison
| Plan | ChangeThisFile | Mux |
|---|---|---|
| Free tier | 1,000 conversions/month (no card) | No free tier — pay-as-you-go from first upload |
| Entry paid | $29/mo — 10,000 conversions | ~$0.015/min encoding + $0.0015/min stored + egress |
| $99/mo equiv. | $99 Startup — 50,000 conversions | Variable — depends heavily on file length and views |
| High volume | $499 Scale / $1,999 Growth | Enterprise contracts available |
| Billing model | Per conversion (flat) | Per encoding minute + storage + egress (three meters) |
Mux's pricing has three separate meters: encoding time, storage duration, and data egress. A 10-minute video uploaded, stored for a month, and viewed 1,000 times accumulates costs across all three. For pure file conversion use cases, this model is unnecessarily complex — you're paying for infrastructure you don't use.
ChangeThisFile charges once per conversion, regardless of file length. Convert a 2-minute MP4 or a 30-minute MP4 — same cost.
Feature comparison
| Feature | ChangeThisFile | Mux |
|---|---|---|
| Free API tier | Yes — 1,000/mo, no card | No |
| HLS/DASH adaptive streaming | No | Yes — core feature |
| ABR ladder (multiple resolutions) | No | Yes |
| DRM (Widevine, FairPlay) | No | Yes |
| Video player SDK | No | Yes (Mux Player) |
| CDN video hosting | No | Yes |
| Format conversion (MP4↔WebM, etc.) | Yes — FFmpeg full codec support | No — encodes to streaming format only |
| Audio extraction (MP4→MP3) | Yes | No |
| Video thumbnails / GIF preview | Yes (MP4→GIF) | Yes (via Mux Image API) |
| Per-request API | Yes — sync POST, file back immediately | Async — poll for asset readiness |
| Video analytics | No | Yes — playback quality metrics |
API and developer experience
ChangeThisFile has no SDK — the endpoint is the interface. POST a file, get a converted file back. Source format is auto-detected from the filename; you only specify the target.
curl -X POST https://changethisfile.com/v1/convert \
-H "Authorization: Bearer ctf_sk_your_key" \
-F "file=@video.mov" \
-F "target=mp4" \
--output converted.mp4
No SDK to install. No job polling. The response is your converted file. Works identically in curl, fetch, requests, or any HTTP client.
Mux has official SDKs for Node, Python, Ruby, Go, and others, plus a detailed async API. You upload a video, get back an Asset ID, poll until the asset is ready, then serve the HLS URL to your player. This is the right model for streaming infrastructure — not for one-off conversions.
If you need to convert a MOV to MP4 and you're integrating in an afternoon, ChangeThisFile requires zero setup beyond an API key (free, no card).
Video format coverage
ChangeThisFile covers 690 total conversion routes. Video routes via FFmpeg include: MP4, WebM, MKV, AVI, MOV, 3GP, FLV, WMV, OGV, M4V, TS, MPEG, and animated GIF. Audio extraction routes cover MP3, WAV, FLAC, AAC, M4A, OGG, and OPUS as outputs from video inputs. Full codec support through FFmpeg — H.264, H.265/HEVC, VP8, VP9, AV1.
Mux doesn't expose format conversion in this sense. It accepts common video inputs and transcodes to its own adaptive streaming format. You can't ask Mux to give you back an MP4 — it gives you an HLS stream URL.
For GIF creation (e.g., MP4 to GIF for previews, social media, or documentation), ChangeThisFile handles this directly. Mux has a separate Image API for thumbnails but not animated GIF output.
When to choose which
| Use case | Recommended |
|---|---|
| Stream video to end users with adaptive bitrate | Mux |
| Embed a video player in your app | Mux |
| DRM-protected video delivery | Mux |
| Video playback quality analytics | Mux |
| Convert MP4 to WebM for browser compatibility | ChangeThisFile |
| Extract audio track from a video file | ChangeThisFile |
| Normalize uploads to MP4 before processing | ChangeThisFile |
| Convert MOV files from a camera pipeline | ChangeThisFile |
| Generate GIFs from video clips | ChangeThisFile |
| Free tier / no-card prototyping | ChangeThisFile |
Using both tools together
These tools compose naturally for certain pipelines. A common pattern:
- User uploads a MOV or AVI file (camera format)
- Send to ChangeThisFile API → normalize to MP4 H.264
- Upload the normalized MP4 to Mux for adaptive streaming
This gives you reliable Mux ingest (not all formats/codecs are treated equally by encoders) plus Mux's streaming infrastructure for playback. ChangeThisFile handles the messy file normalization step cheaply; Mux handles the streaming infrastructure.
Get a free ChangeThisFile API key at changethisfile.com/v1/keys/free — no card required, 1,000 conversions/month.
Mux and ChangeThisFile aren't really competitors — they solve different layers of the video problem. Mux owns streaming delivery; ChangeThisFile owns format conversion. If your question is "how do I stream video to users," the answer is Mux. If your question is "how do I convert this MOV to MP4," the answer is ChangeThisFile. Grab a free API key and run a conversion in under a minute — no card, no SDK, just a curl command.