ADVANCED DEVELOPER
Free HTTP Request Builder online
Generate cURL, fetch, and raw HTTP.
Use HTTP Request Builder to generate cURL, fetch, and raw HTTP in seconds, straight from your browser. Enter your file, review the live HTTP Request Builder output, then copy or download it. HTTP Request Builder processes everything in your own browser, so your data never leaves your device.
- Free to use
- No signup
- Private and local
- Unlimited use
Why use HTTP Request Builder
- generate cURL, fetch, and raw HTTP without installing software
- Your file is processed on your device by HTTP Request Builder, never uploaded
- HTTP Request Builder needs no account, email address or payment details
- HTTP Request Builder shows live output that updates as you type
- HTTP Request Builder is keyboard accessible and screen-reader friendly
- HTTP Request Builder is free forever, with no watermark on the result
HTTP Request Builder 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 HTTP Request Builder
- Enter your file Paste or type your file into the input panel above.
- Adjust the options Set the options that control how HTTP Request Builder handles your input.
- Apply the change HTTP Request Builder 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 HTTP Request Builder works. HTTP Request Builder never sends it to a server, so confidential work stays confidential.
Instant results
There is no upload step, so HTTP Request Builder starts the moment you add your file.
No signup, no limits
Use HTTP Request Builder as many times as you want. HTTP Request Builder asks for no account, adds no watermark and keeps no paid tier gating the output.
Works on any device
HTTP Request Builder runs in any modern browser on desktop, tablet and phone, with a keyboard-accessible interface throughout.
Who it is for
For developers
Developers use HTTP Request Builder to debug and ship faster without installing software: generate cURL, fetch, and raw HTTP on a shared or locked-down machine.
For freelancers
HTTP Request Builder helps freelancers send client deliverables quickly, since your file never leaves the laptop it was created on.
For support teams
HTTP Request Builder helps support teams answer customer requests quickly, since your file never leaves the laptop it was created on.
How it works
HTTP Request Builder 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 HTTP Request Builder happens inside your browser sandbox.
Frequently asked questions
Is HTTP Request Builder free to use?
Yes. HTTP Request Builder is completely free with no account, no trial and no usage cap. Every feature on this page is available on the first visit.
Does HTTP Request Builder upload your file to a server?
No. HTTP Request Builder 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?
HTTP Request Builder 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 HTTP Request Builder?
No installation is needed. HTTP Request Builder runs in Chrome, Edge, Firefox and Safari, on desktop and on mobile, with no extension or plugin.
Can I use HTTP Request Builder on a phone or tablet?
Yes. The HTTP Request Builder 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. HTTP Request Builder keeps everything in temporary browser memory, so closing the tab removes every trace of the session.
Related tools
- HTTP Header Parser | Parse HTTP response headers
- HTTP Status Lookup | Look up HTTP status code meanings
- cURL to Fetch | Convert cURL commands to JS fetch()
Last updated: 2026-09-07