Looking for something like Online Tools? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 1 are free or have a free plan.
Online Tools offers browser-based utilities for hashing, encoding, encryption, formatting, compression, file processing, and more.
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | RSA encryption, decryption and prime calculator | — | Not stated | Web |
| 2 | Evervault | — | Not stated | Web |
| 3 | Let's Encrypt | — | Not stated | Web |
| 4 | Awesome Cryptography | — | Not stated | — |
| 5 | Steganography Online | — | Not stated | Web |
| 6 | NSLookup | — | Not stated | Web |
| 7 | Diceware Generator | — | Not stated | Web |
| 8 | Text and File Hash Calculator | — | Not stated | Web, Windows |
| 9 | Favicon hash | — | Not stated | Web |
| 10 | OTP Auth | Freemium | Not stated | iOS, Web |
This RSA calculator supports prime generation, encryption, and decryption.
Protect payment data with Evervault’s encryption model while retaining control of the payment experience.
Let’s Encrypt is a nonprofit that provides automated TLS certificates for securing websites with HTTPS.
This GitHub list curates cryptography resources and links for people exploring the field.
Steganography Online encodes a message into an image and can decode messages from images.
Look up DNS records and nameservers with NSLookup.io’s network utilities.
Diceware Generator creates passphrases using Diceware word lists in 22 languages and offers formatting options.
The Text and File Hash Calculator computes hashes such as MD5, SHA-1, SHA-256, SHA-512, and Whirlpool.
Favicon Hash generates a hash from a website favicon for use in Shodan searches.
Manage two-factor authentication codes with OTP Auth, an iOS app listed on the App Store.
Generate secure SSL configurations for selected web, database, and mail software.
This browser-based converter turns user-supplied text into an image file for downloading or use in other documents.
Lucia was deprecated in March 2025. The website was updated in July 2026 and points to code/auth_session.ts as a single-file replacement for the NPM package and to the Auth Book for auth information.
GoPlus offers Web3 security tools including audits, APIs, a user security hub, and a browser extension.
Test a browser for privacy leaks, including exposed IP addresses, device information, and fingerprinting risks.
See what information a website can access from your browser with Webkay, a browser data demonstration.
Binary Ninja supports software reverse engineering and can be tried in a browser or installed as a desktop application.
Big Number Calculator evaluates very large mathematical expressions in a web browser.
Test how trackers and fingerprinting systems see your browser with Cover Your Tracks from the EFF.
Graphviz Online renders graph descriptions into diagrams in a browser.
Check browser fingerprints and run DNS leak, IP, port, and WebRTC tests with BrowserScan.
Test-IPv6 checks whether a browser and network connection can reach IPv6 resources.
This HTML editor supports writing and converting HTML, including Word-to-HTML conversion in a browser interface.
Test browser fingerprinting characteristics with CreepJS, which displays fingerprint and WebRTC results.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative
