DEVTOOLIO

176 tools · no account

Developer tools. Minus the friction.

Practical tools for coding, converting, calculating, and getting work done — all in one place. Most run in your browser.

Popular:BMI CalculatorAge CalculatorPercentage CalculatorGPA CalculatorImage Resizer
  • Runs in this tab
  • Free
  • No signup

Browse by category

Counts come from the live catalog.

Calculators

28

BMI, loans, tips, dates, percentages — the usual stuff.

Student Tools

11

GPA, attendance, marks and exam countdown.

Writing & Paraphrasing

23

Rewrite and check your own draft. Don't paste someone else's essay.

Image Tools

25

Resize, crop and compress photos on your computer.

File Converters

11

PDF, JPG, Word and plain text conversions.

Data Tools

6

JSON, CSV, XML and YAML. Paste, convert, copy.

Media Tools

9

Compress, resize or convert a video you already have.

Unit Converters

34

Kg, pounds, °C, miles, liters, MB and GB.

Developer Tools

29

JSON, Base64, JWT, regex, hashes and minifiers.

Featured tools

A short list from tools already marked as popular.

BMI Calculator

Height and weight in. BMI and a range out.

Age Calculator

Find your exact age in years, months and days.

Percentage Calculator

Calculate percentages, increase or decrease of values.

GPA Calculator

Calculate your semester GPA from course grades and credits.

Image Resizer

Set a new width and height, then download the file.

JSON Formatter

Pretty-print, check or minify JSON.

KG → LBS

Convert kilograms to pounds.

Paraphrasing Tool

Rewrite your own draft in Standard, Simple, Formal, Academic, Professional or Creative style.

PDF → JPG

Turn each PDF page into a JPG.

Video Compressor

Shrink a video file by lowering resolution and bitrate.

Mortgage Calculator

Home price, down payment, rate and term. Monthly payment and total interest.

GST / VAT Calculator

Add or remove sales tax. Presets for Pakistan, India, UK and a custom rate.

Timezone Converter

Convert a date and time between cities. No live clock API.

Merge PDF

Combine two or more PDFs into one file.

Compress PDF

Rebuild pages as JPEGs to shrink the file. Text stays readable, photos get softer.

HEIC to JPG

Turn an iPhone HEIC photo into a JPG.

Text Compare

See which lines differ between two drafts.

QR Code Generator

Type a URL or some text. Download a PNG.

Password Generator

Random passwords from your browser’s crypto API.

Developer utilities

Formatters, encoders, hashes, timestamps, and validators. Paste, get a result, copy it back.

Open developer tools

JSON Formatter

Pretty-print, check or minify JSON.

Base64 Encoder

Turn text into a Base64 string.

Base64 Decoder

Decode a Base64 string back to text.

URL Encoder

Percent-encode a URL or query string.

URL Decoder

Decode a percent-encoded URL string.

HTML Entity Encoder/Decoder

Escape or unescape HTML entities.

How a tool works

  1. 01

    Open a page

    Search or pick a category. One URL, one job.

  2. 02

    Type or drop a file

    Numbers, text, a photo, a clip. Most of it stays in this tab.

  3. 03

    Copy or download

    Take the result and leave. No account first.

What stays on your machine

Most converters and editors run in this tab. We do not get a copy of the numbers, drafts, or files you drop in. Ads, if they appear later, pay for hosting. You still get the answer without clicking one.

  • Free, no signup
  • Works in current browsers
  • No social downloaders
  • Writing tools are for your drafts