gotomars.app/tools is a collection of handy online utilities for developers and IT professionals. Convert, encode, format, generate — all in one place, all for free.
No registration · No installation · Works in any browser
Organized by category. Every tool runs entirely in your browser — nothing is sent to a server.
JSON ↔ YAML, Date format converter, Color format converter (HEX/RGB/HSL), Number base converter, and more.
Base64 encode/decode, URL encode/decode, HTML entities, JWT decoder, Unicode converter, and Morse code.
MD5, SHA-1, SHA-256, SHA-512 hash generators. Bcrypt hasher. HMAC generator. Random password generator.
JSON formatter & validator, XML formatter, SQL formatter, Markdown preview, HTML minifier/beautifier.
UUID / ULID generator, Lorem ipsum text, Random data generator, QR code generator, Cron expression helper.
IPv4/IPv6 subnet calculator, URL parser, HTTP status code reference, MIME type lookup, User-agent parser.
No setup, no account. Just open and use.
Open the tools site in any modern browser. No installation, no sign-up, no extensions needed. The entire application runs client-side — your data never leaves your machine.
Use the search bar at the top to find tools instantly by name or keyword (e.g. "base64", "hash", "uuid"). Or browse through the organized categories in the sidebar. New tools are added regularly.
Every tool has a simple input/output interface. Paste your data, and the result appears immediately — most tools update in real time as you type. No "Submit" buttons to click.
Example: Paste a JWT token into the JWT Decoder and see the header, payload, and expiry time broken down instantly.
Every tool has a one-click Copy button. Results are formatted cleanly for immediate use in your code, terminal, or documents.
Each tool has a unique URL. Bookmark the tools you use most often for instant access. You can also mark tools as favorites within the app.
Built for developers, used by everyone who works with data.
Decode JWTs during API debugging, format JSON API responses, generate UUIDs for database records, and verify hash values — all without leaving the browser.
Convert HEX colors to RGB/HSL, encode SVGs for CSS, minify HTML, parse URL parameters, and generate Lorem Ipsum filler content for mockups.
Generate bcrypt hashes for password testing, compute SHA-256 checksums for file integrity, decode Base64-encoded credentials, and analyze JWT claims.
Calculate subnets and CIDR ranges, parse cron expressions, look up HTTP status codes, convert between YAML and JSON configs, and generate random secrets.
gotomars.app is a productivity platform built for developers who are tired of Googling the same utility websites over and over. We believe the best tools are fast, focused, and free — with no account walls or paywalls in the way.
Our tools site is powered by it-tools, an open-source project by the community. We host a curated, always-updated instance at tools.gotomars.app so you always have a reliable, fast mirror available.
Every tool runs 100% in your browser. We never see your input data — it never touches our servers. This is a core design principle we will never compromise on.
Built and maintained by an indie developer who got tired of juggling 10 different utility tabs. ❤️
View Source on GitHubClient-side tools mean zero server round-trips. Results are instant, even on slow connections.
Your input data is processed in your browser only. We have no logs of what you paste into any tool.
Built on open-source foundations under the GPLv3 license. Transparent, auditable, and community-driven.
Last updated: March 27, 2026
By accessing or using gotomars.app ("the Service"), you agree to be bound by these Terms of Service. If you do not agree, please do not use the Service.
gotomars.app provides a collection of free online utilities for developers and IT professionals. All tools run client-side in your browser. We do not store, process, or transmit your input data on our servers.
You are solely responsible for:
You may not use the Service for any unlawful purpose or in any way that could damage, disable, or impair the Service. Automated scraping or bulk use that degrades performance for other users is prohibited.
The Service is provided "as is" without warranties of any kind. Tool outputs are provided for convenience and should be verified before use in production systems. We are not liable for errors in tool results.
To the fullest extent permitted by law, gotomars.app shall not be liable for any indirect, incidental, or consequential damages arising from your use of the Service.
We may update these terms at any time. Continued use of the Service constitutes acceptance of the revised terms.
Last Updated: March 27, 2026
At gotomars.app, accessible from https://gotomars.app, one of our main priorities is the privacy of our visitors. This Privacy Policy document contains types of information that is collected and recorded by gotomars.app and how we use it.
gotomars.app follows a standard procedure of using log files. These files log visitors when they visit websites. The information collected by log files include internet protocol (IP) addresses, browser type, Internet Service Provider (ISP), date and time stamp, referring/exit pages, and possibly the number of clicks. These are not linked to any information that is personally identifiable.
Like any other website, gotomars.app uses "cookies". These cookies are used to store information including visitors' preferences, and the pages on the website that the visitor accessed or visited. The information is used to optimize the users' experience by customizing our web page content based on visitors' browser type and/or other information.
Google is one of a third-party vendor on our site. It also uses cookies, known as DART cookies, to serve ads to our site visitors based upon their visit to gotomars.app and other sites on the internet. However, visitors may choose to decline the use of DART cookies by visiting the Google ad and content network Privacy Policy at the following URL — https://policies.google.com/technologies/ads
Some of the advertisers on our site may use cookies and web beacons. Our advertising partners include:
Each of our advertising partners has their own Privacy Policy for their policies on user data. You can opt out of personalized advertising at Google Ad Settings or through the NAI opt-out tool.
gotomars.app's Privacy Policy does not apply to other advertisers or websites. Thus, we are advising you to consult the respective Privacy Policies of these third-party ad servers for more detailed information. It may include their practices and instructions about how to opt-out of certain options.
Note: All data you input into our tools is processed locally in your browser — it is never sent to our servers or any third party.
We would like to make sure you are fully aware of all of your data protection rights. Every user is entitled to the following:
If you make a request, we have one month to respond to you.
Under the CCPA, among other rights, California consumers have the right to: request that a business that collects a consumer's personal data disclose the categories and specific pieces of personal data collected; request that a business delete any personal data about the consumer; and request that a business that sells a consumer's personal data not sell the consumer's personal data.
If you make a request, we have one month to respond to you.
This Service is not directed to children under 13 (or 16 in the EU). We do not knowingly collect personal information from minors. If you believe a child has provided personal information, please contact us and we will take steps to remove it promptly.
If you have additional questions or require more information about our Privacy Policy, do not hesitate to contact us at support@gotomars.app.
We're a small team and we read every message. Typical response within 1–2 business days.
GDPR, CCPA, or other legal inquiries regarding data and privacy.
support@gotomars.app