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All tools in one place.

Image, PDF, Dev, Design, and Calc tools. Organized by category, ready to use.

25Tools

7Categories

100%Free

🔥 Most used this week

Loan & Interest Calculator (Compound · FX)

Loan repayment, compound interest, and exchange rates in one place. Compare equal-payment vs equal-principal schedules and savings—inputs stay on your device.

Character Counter

Count characters, words, lines, and UTF-8 bytes as you type. Hit SNS and SMS limits before you post—text stays in the browser.

Image Compressor & Converter

Reduce image and photo file size in your browser. Compress JPG, PNG, and WebP and convert formats with no upload—shrink files for email and web with minimal quality loss.

Image

Image Compressor & Converter

Reduce image and photo file size in your browser. Compress JPG, PNG, and WebP and convert formats with no upload—shrink files for email and web with minimal quality loss.

Image Resizer · Social Media Crop

Crop and resize for Instagram, YouTube, and blog specs. Preset ratios avoid awkward crops—processed locally in your browser.

Docs · PDF

Combine & Merge PDF · Split

Merge PDFs in order or split pages locally in your browser. Files never leave your device—free, no install, for contracts and reports.

PDF to JPG Converter · Image ↔ PDF

Extract PDF pages to JPG/PNG or bundle images into a PDF. Set DPI for sharp output—files processed locally, never uploaded.

Developer

JSON Formatter & Converter

Format, validate, and convert JSON to CSV or YAML in one view. Debug APIs and config files locally—free, nothing sent to a server.

Base64 Encoder & Decoder

Encode and decode text or images to Base64 for Data URLs and API tests. RFC-style conversion in your browser—private and free.

Diff Checker / Text Compare

Compare two texts or code snippets line by line or by character. Spot contract and config changes—paste stays local, no upload.

Regex Tester & Cheat Sheet

Test regex patterns live with flags and a cheat sheet. Parse emails, URLs, and logs—pattern and sample text never leave the browser.

URL Encoder & Decoder

Encode or decode URLs with encodeURIComponent for UTF-8 and special chars. Fix broken query strings—processed locally, free.

Design

Color Palette Generator

Build harmonious palettes and copy HEX, RGB, and HSL. Check WCAG contrast and export CSS or Tailwind tokens—all in your browser.

SVG Image Converter

Export SVG vectors to PNG or JPG at any scale. Keep transparency or set a background—local conversion, no server upload.

CSS Box-Shadow Generator

Dial blur, spread, offset, and color to build box-shadow CSS with live preview. Copy inset shadows—free, no install required.

CSS Gradient Generator

Preview linear and radial gradients and copy background CSS. Set angle and color stops for cards and buttons—in your browser.

CSS clamp() Calculator

Generate responsive clamp(min, preferred, max) for font-size and spacing. Fluid sizing without extra media queries—copy one line.

Convert · Calc

Unit Converter

Convert length, weight, temperature, area, and data units instantly. Metric vs imperial for travel, cooking, and dev—free in-browser.

Loan & Interest Calculator (Compound · FX)

Loan repayment, compound interest, and exchange rates in one place. Compare equal-payment vs equal-principal schedules and savings—inputs stay on your device.

🔥 Hot

Percent Calculator

Calculate discounts, ratios, and percent change instantly. Reverse sale price and savings—no spreadsheet, free in your browser.

Date & D-Day Calculator

Count days to a target date (D-day), find the difference between two dates, or add and subtract days. Free, in your browser.

🔥 Hot

Age Calculator

Enter a birth date to get your exact age, plus your zodiac sign and the days until your next birthday. Free, in your browser.

🔥 Hot

Pyeong Calculator (Pyeong ↔ m²)

Convert between pyeong (the Korean area unit) and square meters both ways, or get pyeong from width × height. Free, in your browser.

🔥 Hot

BMI Calculator

Calculate your BMI from height and weight and see whether you're underweight, normal, overweight, or obese—plus your healthy weight range. Free, in your browser.

🔥 Hot

Generate

QR Code Generator

Create QR codes for URLs, text, contacts, and Wi-Fi; download PNG or SVG. Tips for scan-friendly design—generated locally, free.

Password Generator & Strength Checker

Generate strong passwords and score strength in real time. Length and charset options—credentials created only in your browser.

Text

Character Counter

Count characters, words, lines, and UTF-8 bytes as you type. Hit SNS and SMS limits before you post—text stays in the browser.

🔥 Hot

Case Converter

Convert to UPPER, lower, Title, camelCase, snake_case, and kebab-case. Rename variables and files—processed only in your browser.

Useful Guides & Tips

2026-06-28•12 min read

How to Compress Images to Under 100KB Online for Free

Compress images under 100KB without visible quality loss. WebP vs JPG settings and resize rules—free browser tool for email attachments and strict form upload.

2026-06-27•14 min read

How to Combine PDF Files Online Without Installing Any Software

Merge PDFs in your browser without installing software. Files stay on your device—page order, size limits, and privacy-safe local processing explained step by.

2026-06-26•16 min read

How to Crop and Resize Images on the Client Side using JavaScript Canvas

Resize and crop images client-side with JavaScript Canvas—aspect ratio, EXIF rotation, minimal quality loss. Privacy-first patterns; files stay on the user.

ToolHub — Secure and Fast Browser-Based Web Tools Portal

ToolHub is a collection of free web tools you can use right in your browser — no install required. From file conversion and image compression to developer utilities and everyday calculators, the tasks you reach for most live in one place.

Your data never leaves your device

Most tools run directly inside your browser. Images, PDFs, and text aren't uploaded to a server, so you can handle sensitive documents and personal photos with confidence.

What you'll find here

Developer tools: JSON formatter, regex tester, Base64, text diff
Images & documents: image compression, SVG conversion, PDF merge & convert, social image resizing
Everyday & work: unit converter, finance calculator, QR code generator, color palette, password generator

Each tool page includes real examples and pitfalls to watch for, and the blog goes deeper with practical how-to guides.