Get your render storage back, without losing what matters.

Point it at the NAS, a LucidLink volume or a local drive. It finds every image sequence and movie, shows how each one is stored, ranks the worst offenders on a treemap, then shrinks them in a render queue: the right EXR compression for After Effects or Nuke, heavy ProRes to MP4 or ProRes LT, and QuickTime proxies.

Download for WindowsInstaller, 64-bit Download for macOSSigned and notarised disk image

Free. No account, no tracking. Everything it needs is inside the installer.

Chroma Sequence Archiver on Windows: a treemap of a studio folder beside a list of image sequences and movies ranked by reclaimable space, with three items selected and a render queue of five jobs open on the right. — Chroma Sequence Archiver, shown with a demo library.

What it does

Finds the waste

Scans in parallel, reading one header per sequence or movie, so it stays quick over SMB. EXR, TIFF, PNG, TGA, DPX and QuickTime/MP4: passes, bit depth, compression, alpha, codec. Search, filter by codec and select hundreds at once.

Shrinks it safely

Picture passes go to DWAA, DWAB or ZIP. Data passes (Z, P, N, motion vectors, IDs, cryptomatte) stay lossless and keep their bit depth.

Checks before it swaps

A sample frame is encoded and measured first. Frame count, headers and pixels are verified, and originals are set aside on the same drive, never deleted, with one-click undo.

Queues the lot

Auto-queue picks the biggest wins for a target saving. Converts movies to MP4 (H.264/HEVC) or ProRes LT/Proxy/4444, warns before alpha would be lost, and makes ProRes 4444, 422 HQ and H.264 proxies with sRGB or ACEScg colour.

Cleans the rest of the drive

System Clean mode (Windows) finds app and browser caches, package caches, old temp files, crash dumps, build folders, old installers, large videos and duplicates. Each item says why it is safe or why it is kept. Clean to the Recycle Bin, or delete permanently.

Keeps itself up to date

New releases show up as an Update button. Every update is signature-checked before it installs, so the app only ever accepts builds from Chroma.

Install

Windows: run the -setup.exe installer (or the .msi). It needs Windows 10 or 11 and WebView2, which is already on Windows 11.
macOS: open the .dmg and drag the app into Applications. It is signed with a Developer ID and notarised by Apple. Apple silicon Macs only for now.
Updating: from 0.2.1 on, the app offers new versions itself. If you have 0.1.0, install the latest version by hand once.
Open the app, choose a folder, and press Scan.

OpenImageIO and FFmpeg are bundled; nothing needs to be on your PATH.

Check your download

Each release lists a SHA256SUMS file. Compare it with your download:

# Windows (PowerShell)
Get-FileHash .\Chroma-Sequence-Archiver_*_x64-setup.exe -Algorithm SHA256

# macOS
shasum -a 256 Chroma-Sequence-Archiver_*.dmg

Open-source parts and source offer

The app runs OpenImageIO (oiiotool, Apache-2.0) and FFmpeg as separate programs. The FFmpeg build is the LGPL one: no GPL and no non-free components, and no x264 or x265. The complete FFmpeg source and the build scripts used for each release are published as the ffmpeg-source asset on the releases page. You can swap in your own FFmpeg by setting CSA_FFMPEG.

Every licence notice ships with the app as THIRD_PARTY_NOTICES.txt and is attached to each release.