What is OmniConverter?

OmniConverter is a free online converter suite with professional-grade tools for unit conversion across 20+ categories, color design tools (palette generator, gradient maker, color picker), 200+ Google Fonts browser, image compression and conversion (17 tools), PDF tools, text utilities (case converter, word counter, diff checker), technology history timelines, and news coverage across 7 sections.

Is OmniConverter free to use?

Yes, all OmniConverter tools are completely free. No sign-up, no account, no subscription required. Just open and convert.

Does OmniConverter support multiple languages?

Yes, OmniConverter is available in 8 languages: English, Spanish, French, German, Chinese, Japanese, Hindi, and Arabic. Blog posts are in English only.

What unit conversions does OmniConverter support?

OmniConverter supports 20+ unit categories including length, weight, temperature, area, volume, speed, time, currency, digital storage, pressure, energy, power, force, frequency, angle, fuel consumption, shoe size, clothing size, ring size, and more. All conversions use exact factors with live currency rates.

OmniConverterについて

スピード、明快さ、そして妥協のない正確さを追求した、グローバルな単位変換のための究極の精密ツール。

リアルタイムの精度

入力と同時に瞬時に計算が行われ、科学的な正確さを保証します。

検証済みの定数

当社の変換係数は国際標準化団体から提供されています。

ユニバーサルアクセス

デスクトップからモバイルまで、あらゆるデバイスで完全に対応しています。

最適な視認性

目の疲れを軽減するネイティブのダークモードを搭載。

What We Offer

OmniConverter provides instant, accurate unit conversions across 20+ categories including length, weight, temperature, currency, shoe sizes, clothing sizes, digital storage, frequency, pressure, energy, power, force, electric current, illuminance, typography, speed, volume, area, time, and time zones.

Who OmniConverter Helps

Students and educators worldwide who need reliable unit conversions for homework, lab work, and classroom teaching.
International travellers converting currencies, temperatures, clothing sizes, and shoe sizes.
Engineers and architects requiring precise conversions for force, pressure, energy, and power measurements.
Online shoppers decoding international sizing for fashion and footwear.
Developers and designers converting typography units and digital storage for web projects.
Cooks and bakers adapting recipes between metric and imperial measurements.

Global Reach

Used by millions of people across North America, Europe, Asia, Australia, Africa, and South America, OmniConverter supports eight languages and delivers conversion results in milliseconds to users everywhere.

We don’t sell your attention

No ads inside the converters, no tracking of what you convert. Your numbers stay on your device. We’d rather earn a bookmark than a click.

We don’t guess the math

Every factor is stored unrounded and computed through a base unit in double precision. For currency, we show the Frankfurter/ECB date right on the page.

We don’t disappear

Eight languages, dark mode that actually feels good, and a team that still replies from a real inbox. We build for the long quiet use, not the quick visit.

How we check our work

Someone on the team actually opens the BIPM SI Brochure (9th ed.) and NIST SP 811 — not a random blog. Length, weight, temperature, pressure and the rest are derived from those definitions; currency is pulled from Frankfurter/ECB with the date shown. Then we test against IANA time-zone data for DST, and against ISO 9407 and brand tables for shoe and clothing sizes. If a factor changes, we update the page, not just the code.

Free means we can be picky about correctness. It’s a good trade.

Meet the team

OmniConverter is built by a small, distributed team of engineers and editors. Engineering tends the conversion engine and the 20+ converters, 17 image tools and PDF helpers; Editorial double-checks every constant against NIST/BIPM and shapes the guides so they sound like a person. We’re not huge — we just care a lot. Reach us at support@omniconverter.org and a human will write back.

Engineering — Conversion engine & toolingEditorial — NIST/BIPM verification

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Explore Our OmniTools

Beyond unit conversion, creative tools for designers, developers, writers, and history enthusiasts.