Professional Utilitiesfor Modern Creators
Fast online utilities for images, PDFs, developers, and everyday calculations. Image and PDF conversion runs in your browser; those files are not sent to Utilido for the convert step (you still load the site like any web page).
New: blog articles and a changelog of site updates.
Flagship tools with full guides
Start here for deeper walkthroughs, comparison tables, and FAQs. More converters and calculators sit below in each category grid.
PNG to JPG
Flatten transparency and shrink photo-like PNGs for upload limits.
Open guide PDFPDF Merger
Combine scans and appendices in order without desktop software.
Open guide DeveloperJSON Formatter
Validate, pretty-print, or minify API payloads locally.
Open guide DeveloperCSV to JSON
Turn spreadsheet exports into JSON arrays for scripts and APIs.
Open guide TimeUnix Timestamp
Convert epoch seconds or milliseconds to readable dates.
Open guide ImageWebP to JPG
Move WebP downloads into JPG for older apps and email.
Open guide DeveloperJWT Decoder
Inspect header and payload claims without verifying signatures.
Open guide SecurityPassword Generator
Create strong random passwords for new accounts and vault entries.
Open guideBrowse tool collections
Start from a focused category page when you want a group of related tools and practical guidance.
Image Converters
PNG, JPG, WebP, BMP, GIF, and ICO conversion tools in one place.
View categoryPDF Tools
Merge, split, rotate, watermark, number pages, and edit PDF metadata.
View categoryCalculators
Percentages, tips, BMI, loans, compound interest, ratios, and more.
View categoryDeveloper Tools
JSON, CSV, Base64, URL, JWT, HTML entity, and number base utilities.
View categoryTime Tools
Unix timestamps, timezones, cron, ISO dates, and calendars.
View categoryCrypto Units
BTC, ETH, SOL, and other on-chain unit conversions.
View categoryText Tools
Word count, Markdown preview, case conversion, and placeholder text.
View categorySecurity Tools
Password, hash, and test API key generators.
View categoryImage Converters
15 image format converters processed locally on your device. ⇆ = bidirectional
PNG ⇆ JPG
Convert between PNG and JPEG formats. Bidirectional conversion.
PNG ⇆ WebP
Convert between PNG and modern WebP formats.
JPG ⇆ WebP
Convert between JPEG and efficient WebP formats.
BMP → PNG
Convert BMP bitmap images to compressed PNG format.
BMP → JPG
Convert BMP bitmap images to optimized JPEG format.
BMP → WebP
Convert BMP bitmap images to modern WebP format.
GIF → PNG
Convert a GIF to a still PNG image for docs or editing.
GIF → JPG
Create a still JPG from a GIF when you need a smaller preview.
GIF → WebP
Export a still WebP from a GIF for modern web use.
ICO → PNG
Convert ICO icon files to PNG format.
ICO → JPG
Convert ICO icon files to JPEG format.
ICO → WebP
Convert ICO icon files to WebP format.
Developer Utilities
7 text utilities. Encoding and formatting run in your browser; pasted text is not sent to Utilido for those steps.
JSON Formatter
Validate, pretty-print, minify, and inspect JSON data.
Base64 Encoder
Encode and decode Base64 with UTF-8 support.
URL Encoder
Percent-encode and decode URLs and query strings.
CSV ⇆ JSON
Convert between CSV and JSON formats instantly.
HTML Entities
Encode and decode HTML special characters.
Number Base
Convert between binary, octal, decimal, and hexadecimal.
JWT Decoder
Inspect JWT token headers and payloads.
Text Utilities
4 text tools. Counting and conversion run locally in your browser.
Security Tools
3 generators for passwords, hashes, and test API keys in your browser.
Data Generators
3 UUID, random number, and sample data generators in your browser.
Design Tools
3 color and gradient helpers that run in your browser.
Unit Converters
2 unit and temperature converters in your browser.
Scientific & Prime Calculators
2 advanced math calculators that run locally in your browser.
Time & Date Utilities
10 timestamp, timezone, and calendar tools in your browser.
Unix Timestamp
Convert between epoch timestamps and human-readable dates.
Timezone Converter
Convert times between any IANA timezones.
Date Calculator
Add or subtract days, weeks, months, and years from dates.
Cron Parser
Translate cron expressions into plain English.
Countdown Timer
Live countdown to any target date and time.
Stopwatch
Precise stopwatch with lap time tracking.
Duration Calculator
Calculate exact duration between two datetimes.
ISO 8601 Converter
Parse and format ISO 8601 date strings.
Week Number
Calculate ISO week number and day of year.
Age Calculator
Calculate exact age in years, months, and days.
Crypto Unit Converters
10 high-precision cryptocurrency converters powered by BigInt arithmetic. Zero floating-point errors.
Bitcoin
Convert satoshi and BTC with BigInt precision.
Ethereum
Convert wei, gwei, szabo, finney, and ETH.
Solana
Convert lamports and SOL with BigInt precision.
Cardano
Convert lovelace and ADA with BigInt precision.
XRP
Convert drops and XRP with BigInt precision.
Polkadot
Convert plancks and DOT with BigInt precision.
Avalanche
Convert nAVAX, µAVAX, mAVAX, and AVAX.
Tron
Convert sun and TRX with BigInt precision.
Chainlink
Convert juels and LINK with BigInt precision.
Cosmos
Convert uatom and ATOM with BigInt precision.
PDF Toolkit
7 PDF tools that merge, split, and edit files in your browser; files are not sent to Utilido for the convert step.
Merge PDFs
Combine multiple PDF files into a single document.
Split PDF
Extract specific pages or split a PDF into individual pages.
Rotate Pages
Rotate PDF pages by 90°, 180°, or 270° clockwise.
Images → PDF
Convert multiple images (JPG, PNG) into a single PDF.
Add Watermark
Add text watermarks with customizable position and opacity.
Page Numbers
Add page numbers to your PDF with custom formatting.
Edit Metadata
View and edit PDF metadata like title and author.
Everyday Calculators
8 calculators that run locally in your browser. Not medical or financial advice.
Percentage Calculator
Calculate percentages, changes, and proportions.
Tip Calculator
Calculate tips and split bills for groups.
BMI Calculator
Check BMI with metric and imperial support.
Loan Calculator
Estimate monthly payments and total interest.
Compound Interest
See how investments grow over time.
Calorie / TDEE
Estimate daily energy expenditure and calorie needs.
Ratio Calculator
Simplify ratios, solve proportions, and scale.
Built Different
Utilido is designed for speed, privacy-aware workflows, and reliable everyday utility.
Lightning Fast
Image and PDF tools process files instantly in your browser with WASM-backed libraries.
Privacy Aware
Image and PDF work stays on your device. Other utilities also run locally where possible.
Always Available
Free tools with no account required. Open a page and start working.
Ready to get started?
Try our tools now: no account needed. Fast, free, and focused on local processing where it applies.