Skip to main content
431+ Free Tools

Free Online Tools for Developers & Websites

SSL, DNS, JSON, SEO, SQL, CSS, image, password and developer tools - fast, private and free. No signup needed.

Most Used

Popular Tools

View All Tools

Compress PDF

Reduce PDF file size in your browser. Light mode keeps text...

Merge PDF

Combine several PDF files into one document in the order you...

Image Compressor

Reduce the file size of JPG, PNG, WebP and HEIC photos to a...

Word Counter

Count words, characters, sentences and paragraphs as you typ...

EMI Calculator

Calculate the monthly EMI, total interest and full repayment...

Income Tax Calculator (Old vs New Regime)

Compare your income tax under the new and old regimes for FY...

JSON Formatter

Instantly format and pretty-print any JSON, right in your br...

SSL Certificate Checker

Instantly check a domain's SSL certificate status, expiry da...

JPG to PDF

Turn JPG, PNG or WebP images into a PDF, one image per page,...

Passport Size Photo Maker

Make passport and visa photos in 35 x 45 mm, 2 x 2 inch and...

SIP Calculator

Estimate mutual fund returns for a monthly SIP, a step-up SI...

PDF to JPG

Convert PDF pages to JPG or PNG images at the resolution you...

Text Compare (Diff Checker)

Compare two texts and highlight every difference by line, wo...

GST Calculator

Add GST to a price or remove it from a GST-inclusive price a...

Case Converter

Convert text to UPPERCASE, lowercase, Title Case, Sentence c...

DNS Lookup

Instantly look up A, AAAA, MX, TXT, NS, CNAME, SOA, and CAA...

WHOIS / RDAP Lookup

Look up a domain's registration details - registrar, registr...

Secure Password Generator

Generate cryptographically random passwords using your brows...

Sign PDF

Draw or type your signature and place it on any page of a PD...

Base64 Encoder / Decoder

Instantly encode or decode Base64 text, right in your browse...

WebP Converter

Convert an image to WebP using your browser's own encoder, w...

Percentage Calculator

Calculate percentages - X% of Y, percentage increase/decreas...

JWT Decoder

Instantly decode a JWT's header and payload, right in your b...

SPF Checker

Check whether a domain has a valid SPF record configured.
View All Tools
Explore

Browse Tools by Category

View All Categories
SSL Tools
3 Tools
DNS Tools
12 Tools
Domain Tools
12 Tools
Website Tools
19 Tools
Security Tools
10 Tools
Email Tools
8 Tools
Performance Tools
10 Tools
SEO Tools
12 Tools
API & Developer Testing Tools
17 Tools
Git & GitHub Tools
18 Tools
DevOps Tools
16 Tools
Linux & System Administration Tools
17 Tools
Database & SQL Tools
20 Tools
AWS & Cloud Tools
16 Tools
Kubernetes Tools
14 Tools
Programming Language Tools
23 Tools
Frontend / CSS Tools
20 Tools
Image / SVG Developer Tools
18 Tools
Security & Authentication Tools
14 Tools
File & Data Conversion Tools
20 Tools
Data / Number / Computer Science Tools
19 Tools
Software Version / Package Tools
9 Tools
Developer Documentation / Project Tools
11 Tools
Byte Array Tools
17 Tools
Text & Writing Tools
28 Tools
Finance & Loan Calculators
20 Tools
PDF Tools
16 Tools
Image Editing Tools
12 Tools
Why Byteary

Free Tools for the Everyday Work of Building Websites

Byteary is a growing collection of free online tools for developers, website owners and anyone who looks after a site. Each one does a single job well, opens straight away and needs no account - and new tools are added all the time.

  • Instant results, no signup
  • Most developer tools run in your browser - pasted data stays on your device
  • Works the same on desktop and mobile
Read the Guides

For website owners

Check that your SSL certificate is valid and not about to expire, look up DNS records after a hosting move, make sure email passes SPF, DKIM and DMARC so it avoids the spam folder, and review security headers, page speed and on-page SEO against the live page.

SSL certificates DNS records SPF, DKIM & DMARC Security headers Page speed On-page SEO

For developers

Format and convert JSON, CSV, XML and YAML, tidy SQL, generate CSS and optimize images, then create configs for Git, Docker and CI/CD, Kubernetes and Linux servers - without installing anything.

JSON, CSV & YAML SQL CSS Images & SVG Git & GitHub Docker & CI/CD Kubernetes Linux servers
Looking for something else?
Search or browse every tool, grouped by what it helps you do.
Explore All Tools Browse Categories

Latest from Our Blog

View all posts
How to Write the Amount in Words on a Cheque (Lakh, Crore and Paise)

How to Write the Amount in Words on a Cheque (Lakh, Crore an...

Oct 3, 2026
How to Reduce PDF Size for Online Forms (Without Uploading Your Documents)

How to Reduce PDF Size for Online Forms (Without Uploading Y...

Oct 3, 2026
Old vs New Tax Regime for FY 2026-27: Which One Saves You More?

Old vs New Tax Regime for FY 2026-27: Which One Saves You Mo...

Oct 3, 2026

Stay in the loop

New tools and tips - no spam, unsubscribe any time.