UUID Generator Online — Free & Private
Generate random UUID v4 identifiers, one at a time or in bulk. Free, private, and processed entirely in your browser — no upload, no account, no file ever leaves your device.
How to use UUID Generator
Generate random UUID v4 identifiers, one at a time or in bulk. Everything runs in this tab — nothing is uploaded for the core job.
- Enter your content — Type or paste what you want to work with — UUID Generator runs immediately in your browser.
- Choose your options — Set any options UUID Generator offers.
- Get your result — Copy or download the result \u{2014} done entirely on your device, nothing uploaded.
Privacy proof for UUID Generator
This tool processes files in your browser. Open DevTools → Network while you run it: your document is not uploaded. After one online visit, many tools keep working with Airplane Mode on (libraries cached locally).
Popular tools
The highest-demand tools with full options — browse by category below for the rest.
Star any tool — it appears under Favorites on this device.
How this actually works
Each tool runs entirely with JavaScript already loaded in this page — PDF tools via pdf-lib and pdf.js, image tools via the browser's native Canvas API, and everything else with plain JavaScript. Your files or input are read into browser memory, processed, and handed back as a download or copyable result. This page itself is served by a small Laravel route; Laravel never sees your files either. The only backend in use is Supabase, and only for two optional things: signing in with a magic link, and — only if you're signed in — a log of which tool you ran and when. Honest limits worth knowing: Compress PDF flattens each page to a re-encoded image (great for scans, not ideal if you need selectable text after); HEIC conversion uses a small on-demand converter when the browser cannot decode HEIC natively (Safari often works without it); Fill PDF Form is best-effort for simple AcroForm fields, not a full Adobe Forms replacement; and Word/Excel/PowerPoint ⇄ PDF genuinely needs a server-side engine, so it isn't included — this build only ships tools that can honestly run client-side.
Questions people actually ask
What version of UUID does this generate?
UUID v4 — randomly generated, the most common type for general-purpose unique identifiers.
Can I generate more than one at a time?
Yes — choose 1, 5, 10, 25, or 50 at once.
Can I get uppercase UUIDs?
Yes — a letter-case option switches the output between lowercase (the standard convention) and UPPERCASE.
How random are these?
crypto.randomUUID() is used — the browser's own cryptographically secure UUID v4 generator, not a custom or predictable implementation.
Are two generated UUIDs ever the same?
Practically no — UUID v4 has 122 random bits, making a collision astronomically unlikely even across huge numbers of generated IDs.
Can I copy all generated UUIDs at once?
Yes — the result is one list, one per line, ready to copy or download together.
Is there a maximum I can generate in one run?
Up to 50 at once from the dropdown; run it again for more.
Are the UUIDs sent anywhere?
No — generation happens entirely in your browser using the Web Crypto API.
Is this really free, and is there a file size limit?
Yes — no account, no paywall. Since processing happens in your browser's memory rather than uploading anywhere, the practical limit is your device's available RAM, not a server quota. Very large files (500+ pages) may run slower, especially for Compress and PDF→JPG.
Does anything about my file get sent anywhere?
No. Every tool runs with pdf-lib/pdf.js loaded in this page; your file is read into browser memory and never leaves it. The only network call this app makes for your account is Supabase auth — and that only stores which tool you ran and when, never file content.
Why isn't Word/Excel/PowerPoint → PDF included?
Converting Office formats accurately needs a real rendering engine (what Word or LibreOffice use internally) — no browser library does this reliably. Rather than ship a broken version, it's left out.
Does TechDriven Tools have OCR (text recognition)?
Yes — OCR PDF recognizes text in scanned or photographed pages using Tesseract.js, running entirely on your device, and gives you a searchable PDF or a plain text file. Nothing is uploaded for this either.
Can I use this without an internet connection?
Once the page and its libraries have loaded once, yes — the tools themselves need no network access. Signing in and viewing history do require a connection, since those talk to Supabase.
What happens to the "history" if I sign in?
Only a row per tool run — the tool's name and a timestamp. No filename, no file content, ever. You can see the full list any time via the History button.
Are the non-PDF utilities (password generator, JSON formatter, etc.) private too?
Yes — same rule as the PDF tools. Word Counter, Case Converter, Password Generator, UUID Generator, Base64, Hash Generator, JSON Formatter and JWT Decoder all run with plain JavaScript already loaded in this page; nothing you type or paste is sent anywhere.
UUID Generator, in depth
Generate random UUID v4 identifiers, one at a time or in bulk, using the browser's own crypto API.
Features
UUID v4
The standard random-based UUID format, RFC 4122 compliant.
Bulk Output
Generate many at once, one per line.
Copy or Download
Get the list as plain text, ready to paste anywhere.
Instant
No network call — generated locally every time.
Why use UUID Generator
- Generate unique database keys during development or testing.
- Create test data with realistic-looking unique identifiers.
- Assign a unique ID to a record, session, or object in code.
- Produce a batch of IDs for seeding a database or a mock API.
How it works
Each UUID is generated using the browser's built-in crypto.randomUUID() (or an equivalent construction from crypto.getRandomValues()), producing a standard version-4 UUID: 122 random bits formatted as xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx. The collision probability is astronomically small — practically zero for any realistic use case.
UUID v4 vs. other versions
UUID has several versions defined by different generation methods — v1 incorporates a timestamp and network identifier, v5 is deterministic based on a namespace and name. v4 is purely random, which is what the vast majority of everyday use cases (database keys, session IDs, test data) actually need, and it's what this tool generates.
Why people search for UUID Generator
Generate random UUID v4 identifiers, one at a time or in bulk. For teams, share the link instead of emailing binaries of desktop installers — everyone gets the same UUID Generator behavior in a modern browser.
UUID Generator sits in our Developer Tools group. The page is built so you can finish the job without creating an account, installing a desktop pack, or sending the payload to an unknown converter API.
Who UUID Generator is for
- You want a second opinion after another converter produced a weird output.
- You need a result now and do not want another account wall.
- The file or text is sensitive enough that uploading feels wrong.
- A desktop suite is overkill for a one-page or one-photo job.
Recommended workflow
Paste only what you intend to transform → run locally → copy into your editor or terminal → never paste production secrets into random upload sites.
- Open UUID Generator (also available from category hubs and ⌘K).
- Use the labeled fields or dropzone — options match what UUID Generator actually does.
- Run the tool and wait for local progress to finish.
- Download or copy the result, then verify on the device where you will share it.
Tips that improve results
- Keep the original until stakeholders accept the download.
- Rename the output with date + purpose before you attach it to email.
- On phones, plug in power for large PDFs, videos, or spreadsheets.
- Prefer UTF-8 text for developer converters; weird encodings cause most “broken” results.
- Start with a non-sensitive sample so you learn the options before the real file.
- Change one setting at a time when you are comparing quality or layout.
Common mistakes with UUID Generator
- Expecting UUID Generator to replace a full desktop suite for every edge-case format.
- Skipping a sample check and discovering a bad export after the original was deleted.
- Chaining many lossy image/PDF steps when one careful pass would have been enough.
- Using a public computer without clearing downloads afterward.
Privacy model
Processing for UUID Generator is designed to stay in the browser. Laravel serves the page; it does not receive your file bytes for conversion. Optional Supabase auth only stores which tool you ran and when — never filenames or contents.
Related tools
- Password Generator
- Base64 Encoder/Decoder
- Hash Generator
- JSON Formatter
- JWT Decoder
- QR Code Generator
FAQ — UUID Generator
Is UUID Generator free to use?
Yes. UUID Generator on TechDriven Tools is free — no account, no watermark, and no paywall for the core workflow.
Does UUID Generator upload my file or text?
No for processing. UUID Generator runs in your browser tab. Optional sign-in never stores file contents — only tool names and timestamps if you enable history.
When should I use UUID Generator?
Use UUID Generator for Developer Tools jobs where privacy and speed matter: quick one-offs, sensitive inputs, or checking another app’s result without another upload site.
Will UUID Generator work on my phone?
Yes in a modern mobile browser. Large inputs can take longer because your device does the work locally.
What are the limits of UUID Generator?
There is no server quota from us. Limits are your device memory, battery, and formats the browser can decode. UUID Generator will not pretend to support server-only Office or cloud-AI pipelines.
How is UUID Generator different from upload-based sites?
Upload converters send your content to someone else’s server. UUID Generator keeps the transform on-device whenever the format allows, which is the safer default for confidential documents, photos, tokens, and configs.
Bottom line
If you need UUID Generator done quickly and privately, start at /uuid-generator, run it once on a sample, then process the real input. That is how TechDriven Tools stays competitive: honest capabilities, labeled UI, and content that matches what the tool actually ships.
From our blog: What Is a UUID and How to Generate One