OhoTool

Free online converters

Convert between formats without installing anything — images, documents, data, units, and more. Everything runs in your browser unless noted, so your files stay on your device.

25 tools · free · no sign-up

Unit Converter

Convert length, weight, temperature, volume, and more.

Time Zone Converter

Convert a time between any two time zones.

JSON to YAML Converter

Convert between JSON and YAML in both directions.

CSV to ExcelPro

Convert a CSV file to an Excel spreadsheet.

Excel to CSVPro

Convert an Excel spreadsheet to a CSV file.

Markdown to HTML

Convert Markdown to clean HTML with a live preview.

HTML to Markdown

Convert HTML into clean Markdown.

Image Converter (PNG, JPG, WebP)

Convert images between PNG, JPG, and WebP.

Image Resizer

Resize an image to exact dimensions online.

Compress ImagePro

Shrink JPG, PNG, and WebP images to a smaller size.

Bulk Image Converter & ResizerPro

Convert and resize many images at once, then download a ZIP.

HEIC to JPGPro

Convert iPhone HEIC photos to JPG.

HEIC to PNGPro

Convert iPhone HEIC photos to PNG.

Image to Text (OCR)

Extract text from images, photos, and scans.

Base64 Encode / Decode

Convert text to and from Base64 with full Unicode support.

URL Encoder / Decoder

Percent-encode and decode URLs and query parameters.

HTML Entity Encoder / Decoder

Encode and decode HTML entities safely.

String Escape / Unescape

Escape and unescape strings for code and JSON.

JSON to CSV Converter

Convert JSON arrays to CSV and back.

Image to Base64

Encode an image as a Base64 data URI.

Text to Binary

Convert text to binary and back.

Number Base Converter

Convert numbers between binary, octal, decimal, and hex.

Roman Numeral Converter

Convert numbers to Roman numerals and back.

HEX to RGB Converter

Convert colors between HEX, RGB, and HSL with a live preview.

Timestamp Converter

Convert Unix epoch time to dates and back.

Frequently asked questions

Do these converters upload my files?

No — image, text, and data converters run locally in your browser. Your files are never uploaded.

What image formats are supported?

JPG, PNG, WebP, and HEIC, plus resizing, compression, and OCR (image to text).

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