Browser-based · No upload · No account

Turn any video into one long, scrolling image.

Chrunos samples frames from your video and stitches them into a single tall image you can scroll, save, or post — all inside your browser. Your file is never sent anywhere.

Convert a video See how it works
  • Nothing leaves your device
  • Works offline once loaded
  • No watermark, no sign-up

Drop a video here, or click to browse

MP4, WebM or MOV — processed locally, never uploaded

How it works

01

Load the video

Your file is opened locally using your browser's native video decoder. It's never transmitted anywhere — Chrunos has no server component to send it to.

02

Sample frames

Chrunos seeks through the timeline at even intervals and draws each frame onto a canvas, at the width and frame count you choose.

03

Stitch the strip

Every sampled frame is drawn in sequence onto one tall (or wide) canvas, in order, with no gaps or overlap.

04

Export as PNG

The finished canvas is converted to a downloadable PNG using your browser's built-in image encoder. One file, ready to share.

What people use it for

App and gameplay walkthroughs

Turn a screen recording into one scrollable image that's easier to skim, annotate, or paste into documentation than a video clip.

Long-form social posts

Pinterest, Threads, and link-in-bio pages favor tall single images over embedded video. Chrunos gives you that format directly.

Visual QA and diffing

Lay out a UI animation or render sequence frame-by-frame to spot glitches, timing issues, or layout shifts at a glance.

Storyboards and highlight strips

Summarize a trailer, talk, or highlight reel as a single strip you can drop into a slide deck or moodboard.

Why it's actually private

Most "online video tools" upload your file to a server, process it there, and store a copy you have to trust them to delete. Chrunos doesn't have a server to upload to. It's a static page — the conversion happens with your browser's own Canvas and Video APIs, the same ones that let a webpage play video or draw graphics. Close the tab and there's nothing left anywhere but the file you downloaded.

Frequently asked questions

Is my video uploaded to a server?

No. Chrunos reads and processes your video entirely inside your browser using the Canvas API. The file never leaves your device.

What video formats are supported?

Chrunos supports any format your browser can play natively, which typically includes MP4 (H.264), WebM, and MOV. If a file won't load, try converting it to MP4 first.

Is there a file size or length limit?

There's no hard limit set by Chrunos, but very long or high-resolution videos use more of your device's memory since everything runs in-browser. For best results, use clips under 3 minutes.

What can I use the long image for?

Common uses include sharing gameplay or app walkthroughs as a single scrollable image, creating Pinterest-style story strips, visual diffs for QA, storyboards, and highlight reels for social media.

Does Chrunos cost anything?

No, Chrunos is free to use with no account, watermark, or sign-up required.