Free online tools
Practical tools, ready in your browser
NanToo is translating its most useful, thoroughly reviewed tools into English. More tools will appear here as their localized versions pass verification.
Available tools
Developer Tools
URL Encoder and Decoder
Encode URI components or complete URIs, decode UTF-8 percent escapes, and copy or download results in your browser. Includes encodeURIComponent and encodeURI outputs.
Design
DPI/PPI Calculator (Print Size ↔ Pixels)
Convert pixels and PPI to print dimensions, or calculate the pixels needed for a target print size. Compare horizontal and vertical effective PPI and read image dimensions locally in your browser.
Entertainment
Chord Progression Player
Play, transpose, edit, loop, and export chord progressions in your browser. Choose tones, patterns, tempo, chord length, and scale-degree display.
Design
Aspect Ratio Calculator
Calculate and simplify an aspect ratio, find matching resize dimensions, compare common presets, and preview the shape.
Entertainment
Voxel Maker – Online 3D Pixel Art Editor
Create voxel art in a browser-based 3D editor with layers, mirror editing, custom colors, lighting, project save/load, and GLB, VOX, OBJ, or GIF export.
Developer Tools
Online Binary and Hex Editor
Inspect and edit binary files as hexadecimal bytes, compare two files, jump to differences, and download edits without uploading files to a server.
Design
Image Aspect Ratio Calculator and Crop Tool
Read image dimensions and aspect ratio, inspect pixel count and format, then crop to a fixed ratio and download the result locally in your browser.
Developer Tools
File Transfer Time Calculator
Estimate upload, download, backup, or copy time from file size, transfer speed, and an adjustable throughput reduction.
Business
PDF to Image and Image to PDF Converter
Convert PDF pages to PNG or JPEG, or combine JPEG and PNG images into a PDF. Processing stays in your browser.