Built with AI assistance (Claude Code).

Otter EDID Editor

Live at otter-edid.stoatworks-labs.com — nothing to install.

A browser EDID editor for event video. Build an EDID from a resolution and a refresh rate, or edit every field by hand — then see which processors will actually take it, and in which mode.

Nothing is uploaded. There is no backend to upload it to.

Two modes

Simple. Type a resolution and a refresh rate, name it, press Calculate. You get a complete, valid EDID 1.4: the mode as a detailed timing, a range-limits descriptor sized to it, the name where every input menu will read it, and a CTA-861 extension carrying the VIC when the mode has one.

Advanced. Every field. Identity, video input definition, chromaticity, established and standard timings, all four descriptors, the CTA-861 extension (video and audio descriptors, HDMI and HDMI Forum vendor blocks, HDR static metadata, colorimetry, 4:2:0 maps) and a DisplayID 2.0 extension.

Both modes name the EDID. Both show the same two answers on the right.

The two answers

What the mode costs, and the smallest interface that carries it. Pixel clock, raster, line rate, payload — and then the minimum HDMI version (1.0–1.2, 1.3/1.4, 2.0, or which FRL rate), the minimum DisplayPort rate at 4 and 2 lanes, and whether DVI needs one link or two.

Which hardware takes it. Twenty-one models across Analog Way, Barco, PixelHue, Brompton, NovaStar, disguise and Green Hippo, each answering yes / conditional / no — and where the answer is conditional, the capacity mode you have to configure to get it:

• A LiveCore dual-link input costs you the neighbouring input.
• A Barco E2 Gen 1 does 4K60 only across two cables.
• A Barco E2 Gen 2 quad card is four WQXGA inputs or two UHD60 ones.
• An Aquilon DisplayPort card is four DP 1.2 ports or two DP 1.4 ports — and DP 1.4 preempts ports 2 and 4.

Every device carries its sources, quoted, with the date they were read.

DSC and variable refresh

Both are toggles, and both are real: they change the bandwidth arithmetic, they change which interface version is required, and they get written into the EDID (DSC capability and the VRRmin/VRRmax window in the HDMI Forum block). Turning DSC on correctly makes every HDMI 2.0 and earlier input say no, because DSC travels only over a fixed-rate link.

Import

Open a .bin, or paste a hex dump from anywhere — xrandr, edid-decode, xxd, a C header, a bare hex string. A bad checksum is reported, not refused: the dump off a misbehaving device is exactly when you need to look at it.

Running it

npm install
npm run dev

npm test runs the suite. npm run build produces dist/, which deploys as a Cloudflare static-assets Worker.

What is verified, and what is not

The timing engine is checked against published VESA DMT values, and the DisplayID Type VII layout against the Linux kernel's parser. The hardware table is vendor paperwork, cited per claim, and has not been tried against any hardware. See AGENTS.md for the honest breakdown.

Not affiliated with Analog Way, Barco, PixelHue, Brompton, NovaStar, disguise or Green Hippo. Product names appear only to state compatibility.

MIT.