Best Free Online Developer Tools to Use in 2026
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
Utilities
Free online developer utilities: SMS counter, password generator, cron job builder, timestamp converter, image optimizer, PDF tools, and more.
SMS Counter
Count SMS characters and message segments
Credit Card Validator
Validate credit card numbers with Luhn algorithm and issuer detection
IBAN Validator
Validate International Bank Account Numbers with checksum verification
BIC/SWIFT Lookup
Lookup BIC/SWIFT codes with bank name and location details
ISBN Validator
Validate ISBN-10 and ISBN-13 book identifiers with checksum verification
US ZIP Code Lookup
Lookup ZIP code details by code, city, or state
Phone Number Validator
Validate international phone numbers with country code detection
VAT Number Validator
Validate European VAT numbers with format checksum verification
SSN Validator
Validate US Social Security Number format with area/group validation
Check String Length
Count characters and words in text
Password Generator
Generate strong random passwords online
Chmod Calculator
Calculate Linux file permission numbers
Cron Job Command Generator
Generate cron job commands and schedules
Cron Expression Parser
Parse and explain cron expressions
Shortened URL Checker
Expand and check shortened URLs safely
RGB to HEX Converter
Convert RGB colors to HEX and vice versa
Epoch / Unix Timestamp Converter
Convert timestamps to readable dates and back
UUID & ULID Generator
Generate UUID v4 and ULID identifiers
Timezone Converter
Convert time across different time zones
Image Resizer
Resize images online to any dimension
Image Optimizer
Compress and optimize image file size
Image Converter
Convert images between different formats
Image Cropper
Crop images online with custom dimensions
Image Watermark
Add watermark text or logo to images
Image Merger
Merge multiple images into one online
Image Metadata Extractor
Extract EXIF and metadata from images
Favicon Generator
Generate favicons from images or text
Color Palette Extractor
Extract color palette from any image
PDF Compressor
Compress and reduce PDF file size online
PDF Text Extractor
Extract text from PDF documents online
PDF to Image
Convert PDF pages to images online
PDF Splitter
Split PDF into multiple separate files
PDF Metadata Editor
View and edit PDF metadata properties
PDF Page Remover
Remove unwanted pages from PDF files
Code Minifier
Minify and compress source code online
HTML Minifier
Minify and compress HTML code online
CSS Minifier
Minify and compress CSS code online
JS Minifier
Minify and compress JavaScript code online
JSON Minifier
Minify and compress JSON data online
SVG Minifier
Minify and optimize SVG files online
XML Minifier
Minify and compress XML code online
SQL Minifier
Minify and compress SQL queries online
Comment Remover
Remove comments from source code online
Empty Line Remover
Remove empty lines from text online
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