285 free online tools, scribbled just for you

Q: Is PrimeFreeTools really free?

Yes. All tools are free to use with no account, no trial, and no hidden limits. Pages may show ad slots to keep the site running, but the tools themselves are never paywalled.

PrimeFreeTools is a free collection of 285 browser-based tools, calculators, converters, generators, text utilities and developer helpers. Nothing to install, no account, no tracking. Every tool runs 100% in your browser, so it works offline and your data never leaves the device.

Browse all 285 tools What makes PrimeFreeTools different?

285free tools

9categories

100%in your browser

0sign-ups needed

$0forever

Every tool, grouped by category

285 free utilities across 9 categories. Pick one. It opens instantly.

Calculators 84

Converters 38

Formatters 2

URL Slug Generator & Text Cleaner , Turn any text into a clean, SEO-friendly URL slug.
Multi-Case Text Converter , camelCase, snake_case, kebab-case, Title Case and more.

Developer Tools 76

Text Tools 33

Generators 11

Lorem Ipsum Dummy Text Generator , Generate placeholder copy for mockups and wireframes.
UUID v1 / v4 / v5 Generator Suite , Generate UUIDs in any version and quantity.
Random User Profile Generator , Fake names, addresses, and emails for mockups.
Pronounceable Password Generator , Easy-to-say passwords from phonetic syllables.
Dummy CSV File Downloader , Pre-formatted mock data for code testing.
Gitignore Generator , Templates by language/framework.
License Generator , MIT, Apache, GPL, etc.
README Template Generator , Starter README files.
ULID Generator , Sortable unique IDs.
NanoID Generator , Short random IDs.
Random Color Generator , Hex palettes.

Image Tools 17

PNG → JPG / WEBP In-Browser Converter , Convert images between PNG, JPG, and WEBP locally.
Image Color Palette Extractor (HEX) , Pull a hex color palette out of any image.
Multi-Size Favicon Generator (.ico packs) , Generate every favicon size you need.
Custom Brand Color QR Code Builder , Build QR codes in your brand colors.
Barcode Generator (EAN, UPC, Code 128) , Generate EAN, UPC, and Code 128 barcodes.
Color Shade & Tint Generator , Lighter and darker variants of any HEX color.
Image Metadata (EXIF) Viewer , Inspect camera settings and GPS client-side.
Image Format Identifier , Reveal the true type from file headers.
Color Blindness Simulator , Preview palettes under CVD.
Image DPI / Print Size Calculator , Print dimensions from pixels.
Image PPI / Pixel Density Calculator , Pixels per inch.
Image File Size Estimator , Estimate compressed size.
Image to Base64 , Embed images in HTML/CSS.
Base64 to Image , Decode Base64 images.
SVG to PNG Converter , Rasterize SVG locally.
WiFi QR Code Generator , Share Wi-Fi without typing.
vCard QR Code Generator , Contact card QR.

Fun & Games 10

Random Team & Raffle Name Picker , Fairly split names into teams or draw a raffle winner.
Coin Flip & Dice Rolling Simulator , Flip a coin or roll the dice.
Random Emoji Picker , Quick emoji choice.
Pomodoro Timer , Focus/break cycles.
Interval Timer , HIIT/custom intervals.
Metronome , Tap tempo and beats.
BPM Tap Tempo , Tap to find BPM.
Tone Generator , Sine/square/saw frequencies.
Piano Note Frequency Calculator , Note to Hz.
Music Transposer , Shift key and chords.

Security & Network 14

IPv4 Subnet Calculator , Network masks, wildcards, and host ranges.
MAC Address Vendor Lookup , Identify manufacturers from MAC prefixes.
Port Scanner Reference Guide , Interactive directory of common TCP/UDP ports.
Bcrypt Hash Generator , Hash strings for password handling tests.
JWT (JSON Web Token) Decoder , Split tokens into header, payload, and signature.
UUID Checker & Version Validator , Confirm an identifier fits standard UUID syntax.
Credit Card Number Mock Generator (Luhn) , Valid test cards for sandbox checkouts.
IBAN Bank Account Validator , Check IBAN syntax and checksums per country.
ISBN Book Number Validator , Confirms ISBN-10 and ISBN-13 checksums.
HMAC Generator , HMAC with secret and hash.
VIN Decoder , Basic vehicle identification.
Phone Number Formatter / Validator , Normalize numbers.
Punycode / IDN Converter , International domain names.
Unicode Character Inspector , Codepoint, name, block.

What do the guides cover?

Practical how-tos for the tools above. Browse all guides.

Sep 9, 2026

UUID Generator: Unique IDs in Bulk Without Writing Code

Generate UUIDs in any version and quantity.

Sep 9, 2026

Word Frequency Counter: Find Keyword Stuffing (and Gaps) in Seconds

See which words dominate your text.

Sep 9, 2026

Internet Speed Test: What Your Ping, Download, and Upload Actually Mean

Measure latency with a lightweight ping-style check.

Sep 9, 2026

SSL Certificate Expiry Checker: Never Get Caught by an Expired Cert Again

How many days until a cert expires?

What is PrimeFreeTools?

PrimeFreeTools is a free, no-sign-up toolbox of 285 small web tools that run entirely in your browser. It bundles everyday calculators (compound interest, VAT and invoice tax breakdown, tip splitting, percentage and discount math), converters (JSON→CSV, base64, hash, units, Morse, epoch time, number bases), generators (UUID, Lorem Ipsum, QR codes, barcodes), text utilities (word frequency, case conversion, diffing, regex testing, line sorting), and developer helpers (DNS & IP lookup, cron parsing, SSL checking, CSS generators, password entropy).

Unlike online tools that post your data to a server, PrimeFreeTools keeps everything on the device: pages work offline, no account exists, and nothing is traced. The hand-drawn look is deliberate: every card and button is sketched so the toolbox feels approachable rather than corporate.

285 tools live on this site, from calculators to generators.
7 categories: calculators, converters, formatters, generators, text, developers and image tools.
100% client-side, useful for confidential numbers, code or text.
Offline-capable once a tool page has loaded once.
Free to use, no account, no subscription, forever.

Why use PrimeFreeTools?

Because your data never leaves your device, nothing needs installing, and 285 utilities live under one roof. Every tool runs locally in your browser with no account and no tracking, so sensitive numbers or code stay private while you work.

Your data stays on your device
Every calculation happens locally. Paste sensitive numbers or code without worrying about a server logging them.
Nothing to install or sign up for
Open a tool, use it, close it. No cookies, no accounts, no tracking pixels.
A toolbox, not a single tool
285 small utilities under one roof, linked so you jump between "JSON → CSV" and "slug generator" in one click.
Wraps in a hand-drawn interface
Every element is sketched (wobbly borders, pencil shadows, paper texture), so the toolbox is pleasant to use, not sterile.

Frequently asked questions

Is PrimeFreeTools really free?

Yes. All 285 tools are free to use with no account, no trial, and no hidden limits. Pages may show ad slots to keep the site running, but the tools themselves are never paywalled.

Do tools upload my data?

No. Tools run in your browser with JavaScript and never send your input to a server. The tools that need the network (IP, DNS, SSL lookups, QR/barcode image generation) call public read-only APIs, and only the specific value you entered is used.

Does PrimeFreeTools work offline?

Once a tool page has loaded, it runs without a connection because the logic is shipped as static files. Fully offline caching is a planned upgrade.

Which tools are the most popular?

Frequently used tools include the JSON to CSV converter, base64 encoder/decoder, compound interest calculator, invoice tax breakdown, UUID generator, and the URL slug generator.

Can I request a new tool?

Absolutely. New utilities are added regularly. Being a toolbox, every useful small tool fits the catalogue.

🔒 Privacy: PrimeFreeTools has no accounts and no tracking. Tools run in your browser; only the optional network tools (IP/DNS/SSL/QR/barcode) reach out to public APIs with just the value you typed.

285 free online tools, scribbled just for you

Every tool, grouped by category

Calculators 84

Converters 38

Formatters 2

Developer Tools 76

Text Tools 33

Generators 11

Image Tools 17

Fun & Games 10

Security & Network 14

What do the guides cover?

UUID Generator: Unique IDs in Bulk Without Writing Code

Word Frequency Counter: Find Keyword Stuffing (and Gaps) in Seconds

Internet Speed Test: What Your Ping, Download, and Upload Actually Mean

SSL Certificate Expiry Checker: Never Get Caught by an Expired Cert Again

What is PrimeFreeTools?

Why use PrimeFreeTools?

Your data stays on your device

Nothing to install or sign up for

A toolbox, not a single tool

Wraps in a hand-drawn interface

Frequently asked questions

Is PrimeFreeTools really free?

Do tools upload my data?

Does PrimeFreeTools work offline?

Which tools are the most popular?

Can I request a new tool?

✏️ PrimeFreeTools

Popular tools

Guides

Company & legal