CSS PLAYGROUND
Free Flexbox Playground online
Interactive Flexbox sandbox with live CSS export.
Flexbox Playground is a free browser tool that lets you interactive Flexbox sandbox with live CSS export. Enter your file, review the live Flexbox Playground output, then copy or download it. Flexbox Playground works on your device only, so no file or text is ever uploaded.
- Free to use
- No signup
- Private and local
- Unlimited use
Why use Flexbox Playground
- interactive Flexbox sandbox with live CSS export without installing software
- Your file is processed on your device by Flexbox Playground, never uploaded
- Flexbox Playground needs no account, email address or payment details
- Flexbox Playground shows live output that updates as you type
- Flexbox Playground is keyboard accessible and screen-reader friendly
- Flexbox Playground is free forever, with no watermark on the result
Flexbox Playground runs entirely inside your browser. Your file is never uploaded, stored or shared, and nothing is retained once you close the tab.
How to use Flexbox Playground
- Enter your file Paste or type your file into the input panel above.
- Adjust the options Set the options that control how Flexbox Playground handles your input.
- Run the tool Flexbox Playground works instantly on your device, with no queue and no upload wait.
- Copy or download Copy the output to your clipboard or download it as a file, free and unlimited.
Benefits
Private by design
Your file stays on your device while Flexbox Playground works. Flexbox Playground never sends it to a server, so confidential work stays confidential.
Instant results
There is no upload step, so Flexbox Playground starts the moment you add your file.
No signup, no limits
Use Flexbox Playground as many times as you want. Flexbox Playground asks for no account, adds no watermark and keeps no paid tier gating the output.
Works on any device
Flexbox Playground runs in any modern browser on desktop, tablet and phone, with a keyboard-accessible interface throughout.
Who it is for
For designers
Designers use Flexbox Playground to prepare assets for handoff without installing software: interactive Flexbox sandbox with live CSS export on a shared or locked-down machine.
For marketers
Flexbox Playground helps marketers publish campaign assets quickly, since your file never leaves the laptop it was created on.
For freelancers
Flexbox Playground helps freelancers send client deliverables quickly, since your file never leaves the laptop it was created on.
How it works
Flexbox Playground loads your file into memory, applies the change you requested to the underlying data rather than to a screenshot of it, and writes a fresh copy for download. Your original stays untouched on disk, and every step of Flexbox Playground happens inside your browser sandbox.
Frequently asked questions
Is Flexbox Playground free to use?
Yes. Flexbox Playground is completely free with no account, no trial and no usage cap. Every feature on this page is available on the first visit.
Does Flexbox Playground upload your file to a server?
No. Flexbox Playground processes your file inside your browser, so it never reaches a DocTools server. That also means the tool keeps working if your connection drops mid-task.
Is there a limit on how much input I can use?
Flexbox Playground handles inputs into the megabytes without trouble; the only real limit is how much your browser tab can hold in memory.
Do I need to install anything to use Flexbox Playground?
No installation is needed. Flexbox Playground runs in Chrome, Edge, Firefox and Safari, on desktop and on mobile, with no extension or plugin.
Can I use Flexbox Playground on a phone or tablet?
Yes. The Flexbox Playground interface adapts to small screens and supports touch input, though very large jobs are faster on a desktop browser.
What happens to your file when I close the tab?
It is discarded. Flexbox Playground keeps everything in temporary browser memory, so closing the tab removes every trace of the session.
Related tools
- CSS Grid Generator | Visual Grid builder with template areas
- CSS Beautifier | Format and indent CSS code
- CSS Minifier | Minify CSS by removing whitespace
Last updated: 2026-09-07