Apps · Andryo Marzuki - Net Zero Productivity by 2050

None of this was a plan. I’ve spent years building little tools whenever something annoyed me, or some website wanted a subscription to do one obvious thing. They just piled up on my drive doing nothing. So I’m finally dumping them online, for free. There’s a charting library in here too, but mostly it’s browser tools. No accounts, no uploads, no paywalls.

Libraries

charted

Zero-dependency SVG charting for Python. pip install charted, 15 chart types, no numpy, pandas or matplotlib. Ships an MCP server.

site · PyPI · GitHub

Tools

I have a low tolerance for paywalls. The kind that let you do 90% of a task, then demand a subscription to download the result. So I started building my own. Every tool here is completely free, runs entirely in your browser (nothing's uploaded, nothing's stored), and always will be. Consider it personal retribution.

Colours

Colour gradient & palette toolkit. LAB gradients, harmonious palettes, contrast and colour-blindness checks, export to CSS, Tailwind & SVG.

PDF Toolkit

Merge, split, compress & convert PDFs. An iLovePDF / Smallpdf alternative.

Image Converter

HEIC to JPG, WebP & PNG, plus compress and resize. A TinyPNG alternative.

QR Code Generator

QR codes with logo, colours & dot styles. PNG / SVG.

Image to Text (OCR)

Extract text from any image, right in your browser.

OG Image Generator

Make social share images (1200×630) in seconds.

Subtitle Editor

Edit, time-shift & convert .srt / .vtt subtitles.

EXIF Viewer & Stripper

View and remove photo metadata (EXIF / GPS).

Favicon Generator

Turn any image into a full favicon set, ready to download.

Photo Collage Maker

Combine photos into grid & freeform collages, then export. No watermark, no upload.

JSON Formatter

Format, validate & minify JSON, with tree view and error highlighting.

Text Diff

Compare two blocks of text and see every change, line by line.

Markdown Editor

Write Markdown with live preview and export to HTML.

Base64 Encoder

Encode and decode Base64, for both text and files.

Hash Generator

Generate MD5, SHA-1 and SHA-256 checksums instantly.

JWT Decoder

Decode and inspect JWT tokens. Header, payload and signature.

Password Generator

Generate strong, random passwords with custom rules.

Unit Converter

Convert length, weight, temperature, data and more.

Regex Tester

Test regex patterns live with match highlighting, groups and explanations. A free regex101 alternative.

Cron Builder

Build and decode cron schedules with a human-readable description and next run times.

CSV / JSON Converter

Convert CSV to JSON and back, with a table viewer. Auto-detects the delimiter.

Timestamp Converter

Convert Unix epoch to and from human dates, across time zones.

UUID Generator

Generate UUID v4, v7 and nano IDs, single or in bulk.

Lorem Ipsum

Generate placeholder text and placeholder images.

CSS Toolkit

Visual generators for box-shadow, gradients, glassmorphism and easing curves.

Barcode Generator

Generate Code128, EAN, UPC and other barcodes. Download PNG or SVG.

Screenshot Beautifier

Frame screenshots with gradients, padding and a window chrome, then export. A free shots.so alternative.

Meme Generator

Add top and bottom text to any image. A free imgflip alternative, no watermark.

Image Cropper

Crop with aspect presets, rotate, flip and resize. A free iLoveIMG alternative.

GIF Maker

Turn a set of images into an animated GIF. A free ezgif alternative.

SVG Optimizer

Shrink SVG files with SVGO in your browser. A free SVGOMG alternative.

Invoice Generator

Fill in items and export a clean invoice PDF. No signup.

Resume Builder

Build a resume and export it to PDF. No account.

E-Signature

Draw your signature and place it on a PDF, all in your browser.

In-browser AI, experimental

Fair warning on these ones. They run actual ML models on your own machine, so expect a chunky first-time download and your laptop fan getting a workout. They're experimental and rough around the edges, a recent browser helps, and a couple of them want WebGPU. The upside is that nothing ever leaves your device.