Sample files you can hotlink: 228 CC0 test fixtures with stable URLs

Prabhash — Thu, 24 Sep 2026 10:11:29 +0000

Every test suite that touches uploads eventually needs a real PDF, a video that seeks, a CSV with a broken row somewhere in it. Usually someone hotlinks a file from a random site, and a few months later it moves or changes and the test breaks for no reason.
loremfile.dev is 228 synthetic files across 78 formats, all CC0, served with CORS and byte ranges, with a SHA-256 for every file.

Use it:

curl -O https://loremfile.dev/pdf/a4-3pages.pdf

Verify it (bytes at a published URL don't change):

import hashlib, json, urllib.request
manifest = json.load(urllib.request.urlopen("https://loremfile.dev/manifest.json"))
entry = next(e for e in manifest["fixtures"] if e["path"] == "pdf/a4-3pages.pdf")
data = urllib.request.urlopen("https://loremfile.dev/" + entry["path"]).read()
assert hashlib.sha256(data).hexdigest() == entry["sha256"]

Or all at once: sha256sum -c sha256sums.txt --ignore-missing (macOS: shasum -a 256 -c sha256sums.txt --ignore-missing).

Edge cases, on purpose
edge/pdf-truncated-60pct.pdf, edge/jpg-truncated-50pct.jpg, edge/mp4-truncated-50pct.mp4, edge/zero-byte.csv, edge/json-bom.json, edge/json-trailing-comma.json, edge/csv-ragged-rows.csv - 19 in total, for when you want to test that a parser fails.

One Limitation:
Around 30 requests/second per IP, 429 above that. A normal test suite should be fine.

Use it in GitHub Actions
Also supports direct integration with Github Actions. Every file gets checked against its hash, and the step fails if a byte's off:

- uses: kumarprabhashanand/loremfile/action@action-v1
  with:
    paths: pdf/minimal.pdf mp4/720p-5s.mp4
    formats: svg

How it's built
Everything's generated from synthetic data by open-source code (MIT) in a pinned container, pushed to Cloudflare R2, and archived as a GitHub release so anyone can mirror it. No accounts, cookies, or analytics. Claude agents did most of the design and implementation here.

https://loremfile.dev

DEV Community: Prabhash

Sample files you can hotlink: 228 CC0 test fixtures with stable URLs