Datamosh: Meaning, How It Works & a Safe 1-Click Version
Datamosh is the melting, smearing effect where one shot dissolves into the next like wet paint. It looks complicated and dangerous — and traditionally it was. Here's what's really happening, and how to get the look without corrupting a single file.
BEFORE
AFTERThe one-paragraph explanation
Compressed video doesn't store every frame in full. It stores occasional complete frames (keyframes / I-frames) and, in between, only the motion needed to get from one frame to the next (P-frames). Datamoshing deletes keyframes or repeats motion data, so the player applies the movement from one shot onto the pixels of another. The result: colors and shapes smear and drift instead of cutting cleanly.
Why the classic method is a pain
The old-school approach means opening a video in a hex editor or a fragile toolchain, hunting for keyframes, and stripping them out by hand. Do it wrong and you get a black screen, a crash, or an unplayable file. It also produces unpredictable results that are hard to repeat.
The safe way: recreate the effect with controls
Instead of breaking a real file, the Glitchest editor reproduces the datamosh look with adjustable controls — so it's repeatable, previewable, and never leaves you with a corrupted export.
- Load two moments or one moving clip. Datamosh reads best where there's motion to smear.
- Pick the Datamosh preset. This sets up the frame-bleed and smearing in one click.
- Time it with an effect box. Place a box right on the cut with a quick fade-in so the bloom builds and lands exactly on the transition.
- Export a clean MP4. The output is a normal, shareable file — the chaos is baked into the pixels, not into a broken container.
Where datamosh looks best
- Transitions between two clips — the signature "bloom" on the cut.
- Beat drops in music videos, ramped in with a faded effect box.
- Dreamy or unsettling moments where you want reality to feel unstable.
Datamosh vs. glitch vs. VHS
They're cousins, not twins. VHS is analog tape degradation (see our VHS effect guide). Glitch is broad digital breakage — RGB splits, blocks, tearing. Datamosh specifically abuses inter-frame compression to make motion melt. Many edits layer all three.
Try it without the risk
You don't need a special build of an old encoder or a corrupted source file. Open the editor, pick Datamosh, and export a clean MP4 — free, in your browser, nothing uploaded.
The exact settings
Start from the Datamosh preset, then set:
| Strength (master) | 52 |
| Glitch Rate | 42 |
| Glitch Width | 48 |
| Block Size | 42 |
| Chaos | 42 |
| Datamosh (trail) | 28 |
| Horizontal Wave | 14 |
| Vertical Wave | 10 |
| Vertical Shift | 30 |
| Vertical Shake | 18 |
| RGB Split | 54 |
| Hue Shift | 26 |
| Noise | 10 |
| Scanlines | 15 |
| Flicker | 12 |
Everything else stays at its default — tweak it, then copy your own look as JSON or a link from inside the editor to share it.
Try it now — add this look to your own clip, free and in your browser.
Open the editor →FAQ
What is datamoshing?
Datamoshing is a glitch technique that removes or duplicates keyframes in compressed video so motion from one shot bleeds into another, creating a melting, smearing effect.
Is datamoshing hard to do?
Traditionally yes — it meant editing raw codec data and often corrupting files. Glitchest recreates the look with controls, so you get the effect without the risk.
Can I datamosh online for free?
Yes. Glitchest produces a datamosh-style effect free and in your browser, then exports a clean MP4.
How does datamoshing work?
Datamoshing works by manipulating video compression data, typically by removing keyframes (I-frames) so that motion vectors apply pixel movement from one scene onto another. This causes visual details from consecutive clips to bleed together, creating a characteristic melting or warping glitch effect.