ImageShack is one of the older image hosting platforms — dating back to 2003 — providing storage, CDN delivery, and basic image transformations for images uploaded to their platform. ChangeThisFile doesn't host anything; it converts: send a file in one format, receive it back in another.
These tools rarely compete directly. This comparison is for developers who've looked at both and want to understand what each actually does — and why format conversion and image hosting are different problems.
Quick verdict
For hosting images and sharing links: ImageShack is a dedicated image hosting service.
For converting files between formats: ChangeThisFile. Free API, 690 routes, no hosting overhead.
For non-image files (video, audio, documents, ebooks): ChangeThisFile only — ImageShack is image-specific.
For a simple conversion API without an account: ChangeThisFile — 1,000 free conversions/month, no card, call /v1/convert directly with curl or any HTTP client.
Pricing comparison
| Plan | ChangeThisFile | ImageShack |
|---|---|---|
| Free tier | 1,000 conversions/month (no card) | Free hosting (limited, ads) |
| Entry paid | $29/mo — 10,000 conversions | ~$3.99/mo — ad-free, more storage |
| Mid tier | $99/mo — 50,000 conversions | ~$7.99/mo — business plan |
| High volume | $499/$1,999/mo | Enterprise / custom |
| Pricing model | Per conversion (flat count) | Per storage GB + hosting plan |
| Developer API | Yes — full conversion API | Limited (upload/retrieve) |
ImageShack's paid plans center on storage and hosting features — ad-free access, more upload storage, and image management. ChangeThisFile's pricing is purely about conversion volume. They bill on fundamentally different axes.
Feature comparison
| Feature | ChangeThisFile | ImageShack |
|---|---|---|
| Free API tier | Yes — 1,000/mo, no card | Limited (upload API) |
| SDK required | No — curl/fetch/requests directly | No |
| Image format conversion | Yes — 690 routes | Basic (resize, some format output) |
| Image hosting / CDN | No | Yes |
| Video conversion | Yes | No |
| Document conversion | Yes | No |
| Client-side conversions | Yes — 161 browser-native routes | No |
| Privacy — files never uploaded | Yes (client-side routes) | No — all files hosted on ImageShack |
| Webhooks | Yes (HMAC-signed) | No |
Format coverage
ImageShack accepts common image formats — JPEG, PNG, GIF, BMP, and a few others — for hosting and sharing. Basic transformations like resize and limited format conversion are available, but it's primarily a hosting service, not a conversion API. Non-image formats are not supported.
ChangeThisFile covers 690 conversion routes across 9 categories. Image: JPG, PNG, WebP, HEIC, AVIF, GIF, BMP, ICO, SVG, TIFF, PSD. Beyond images: video (MP4, WebM, MKV, AVI, MOV, 3GP, FLV, WMV), audio (MP3, WAV, FLAC, AAC, M4A, OGG), documents (PDF, DOCX, ODT, RTF, HTML, Markdown), data (CSV, JSON, YAML, XML, TOML), spreadsheets (XLSX, XLS), fonts (TTF, OTF, WOFF, WOFF2), ebooks (EPUB, MOBI, AZW3, FB2), and archives (ZIP, RAR, 7Z, TAR).
API and developer experience
ImageShack provides a basic upload API for getting images onto their platform. It's primarily intended for programmatic uploads to their hosting service, not for conversion workflows.
ChangeThisFile API is built for conversion: upload a file, receive it back in a different format. No SDK required:
curl -X POST https://changethisfile.com/v1/convert \
-H "Authorization: Bearer ctf_sk_your_key" \
-F "file=@image.png" \
-F "target=jpg" \
--output result.jpg
Source format is auto-detected from the filename. Get a free key at changethisfile.com/v1/keys/free — no card required. Supports Stripe-style idempotency keys and HMAC webhooks for async large-file jobs.
When to choose which
| Use case | Recommended |
|---|---|
| Host and share images online | ImageShack |
| Convert image files between formats | ChangeThisFile |
| Convert video, audio, or documents | ChangeThisFile |
| Free API tier with no card | ChangeThisFile |
| Privacy — files never leave your device | ChangeThisFile (client-side routes) |
| Simple REST API for developers | ChangeThisFile |
ImageShack solves image hosting and sharing. ChangeThisFile solves file format conversion. If you need to convert files between formats programmatically, ChangeThisFile's free API tier is the right tool — 1,000 conversions/month across 690 routes, no card, no proprietary library to install.