toolzip

Building ToolZip — 86 free browser-based tools for image, video, PDF, and developer utilities. Everything runs client-side. No file uploads, no server, no watermark. toolzip.app

Joined on Aug 30, 2026 hello@toolzip.app https://www.toolzip.app

toolzip

Oct 17

Using Vercel KV for a Simple Blog CMS — What I Learned After 100 Posts

#nextjs #vercel #webdev #toolzip

2 min read

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toolzip

Oct 16

Building a Drawing App with Canvas — Smooth Lines, Undo, and Shape Tools

#javascript #canvas #webdev #toolzip

2 min read

toolzip

Oct 15

Image Adjustment in the Browser — Brightness, Contrast, Saturation Without Libraries

#javascript #canvas #webdev #toolzip

2 min read

toolzip

Oct 14

Randomness in JavaScript — Why Math.random() Isn't Random Enough

#javascript #webdev #toolzip

2 min read

toolzip

Oct 13

Building a World Clock with Automatic DST — The Timezone Pitfalls

#javascript #webdev #toolzip

2 min read

toolzip

Oct 12

Text Deduplication Algorithms — From O(n ) to O(n)

#javascript #algorithms #webdev #toolzip

2 min read

toolzip

Oct 11

The Math Behind Compound Interest — And Why It Matters More Than You Think

#javascript #webdev #toolzip

2 min read

toolzip

Oct 10

How Income Tax Works in Korea — Building a Take-Home Pay Calculator

#javascript #webdev #toolzip

2 min read

toolzip

Oct 9

Everything You Need to Know About Favicons in 2026

#webdev #html #toolzip

2 min read

toolzip

Oct 8

Reading Pixel Data from Images Using Canvas — Histograms and Color Analysis

#javascript #canvas #webdev #toolzip

2 min read

toolzip

Oct 7

Building a UTM Link Builder — Why Tracking Links Matter for Developers

#javascript #seo #webdev #toolzip

2 min read

toolzip

Oct 6

Cron Expressions Demystified — Build a Human-Readable Cron Parser

#javascript #devops #toolzip

2 min read

toolzip

Oct 5

Parsing and Formatting SQL in JavaScript — Without a Grammar File

#javascript #sql #webdev #toolzip

2 min read

toolzip

Oct 4

Why You Should Use crypto.randomUUID() Instead of Math.random() for IDs

#javascript #security #webdev #toolzip

2 min read

toolzip

Oct 3

Working with ZIP Files Entirely in the Browser Using JSZip

#javascript #webdev #toolzip

2 min read

toolzip

Oct 2

Generating Thumbnail Images in the Browser with Canvas API

#javascript #canvas #webdev #toolzip

2 min read

toolzip

Oct 1

Building a Live SVG Editor in the Browser — Syntax Highlighting Without a Library

#javascript #svg #webdev #toolzip

2 min read

toolzip

Sep 30

How to Load and Preview Custom Fonts in the Browser Without CSS

#webdev #javascript #fonts #toolzip

2 min read

toolzip

Sep 29

Building a CSS Gradient Generator in the Browser — Linear, Radial, and Conic

#javascript #css #webdev #toolzip

2 min read

toolzip

Sep 28

The Browser Is Your Server — Building File Tools Without a Backend

#webdev #javascript #productivity #tutorial

4 min read

toolzip

Sep 27

Everything You Can Do With Canvas API (That You Probably Didn't Know)

#javascript #webdev #tutorial

4 min read

toolzip

Sep 26

PDF Manipulation in the Browser With pdf-lib — A Practical Guide

#javascript #webdev #pdf #tutorial

3 min read

toolzip

Sep 25

Running 52 Web Tools for Free on Vercel — A Real Cost Breakdown

#webdev #vercel #nextjs #serverless

3 min read

toolzip

Sep 24

WebAssembly in Practice — What It Is, When to Use It, and When Not To

#webassembly #javascript #webdev #performance

4 min read

toolzip

Sep 23

The Complete Guide to File Handling in the Browser

#javascript #webdev #tutorial #files

4 min read

toolzip

Sep 22

Next.js SEO That Actually Works — Beyond Meta Tags

#nextjs #seo #webdev #javascript

3 min read

toolzip

Sep 21

JPEG, PNG, WebP, AVIF, HEIC — When to Use Which (And How to Convert Between Them)

#webdev #javascript #images #performance

3 min read

toolzip

Sep 20

How I Built a Video Compressor That Runs Entirely in Your Browser

#webdev #javascript #ffmpeg #opensource

4 min read

toolzip

Sep 19

Building a BMI Calculator — The Math, the Korean Standard, and the Limitations

#javascript #webdev #health #tools

4 min read

toolzip

Sep 18

Building a Unit Converter in JavaScript — The Edge Cases Nobody Talks About

#javascript #webdev #beginners #tools

4 min read

toolzip

Sep 17

Hash Functions Explained — MD5 vs SHA-256 vs SHA-512 (With Code)

#webdev #security #javascript #beginners

5 min read

toolzip

Sep 16

Your Photos Are Leaking Your Home Address — EXIF Data Explained

#webdev #security #privacy #tools

4 min read

toolzip

Sep 15

How to Watermark Images in Your Browser — No Upload, No Software

#webdev #javascript #tools #images

4 min read

toolzip

Sep 14

Build a D-Day Counter in JavaScript — Date Arithmetic, Timezone Pitfalls, and Edge Cases

#javascript #webdev #tools #beginners

4 min read

toolzip

Sep 13

Compress PDFs in Your Browser — No Upload, No Server, Free

#webdev #tools #javascript #pdf

4 min read

toolzip

Sep 12

Why Chrome Saves Images as .webp — And How to Convert Them Without Uploading

#webdev #javascript #tools #images

3 min read

toolzip

Sep 12

Resize Images in Your Browser — No Upload, No Server, Free

#webdev #javascript #tools #webassembly

2 min read

toolzip

Sep 11

AVIF vs WebP vs JPEG — Which Image Format Should You Use in 2026?

#webdev #javascript #performance #tools

3 min read

toolzip

Sep 10

Convert Videos in Your Browser — No Upload, No Server, Free (MP4, MOV, WebM, AVI, MKV)

#webdev #javascript #webassembly #tools

3 min read

toolzip

Sep 7

Compress Videos in Your Browser — No Upload, No Server, Free

#webdev #javascript #tools #opensource

2 min read

toolzip

Sep 4

How I Built a Client-Side PDF Toolkit — 6 Tools, No Server

#webdev #javascript #opensource #toolzip

5 min read

toolzip

Sep 2

Building a Barcode Generator That Actually Works — The bwip-js EAN-13 Deep Dive

#javascript #webdev #tutorial #opensource

4 min read

toolzip

Aug 31

I built a free browser-based image & utility toolkit — here's what I learned

#webdev #javascript #nextjs #opensource

3 min read

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