Toolkits
Free browser toolkits for images, developers, and finance. Pick a kit and get to work — no installs, no accounts.
What is Toolkits?
Toolkits is a home for small, focused utilities that run in your browser. ImgKit handles image compression and format conversion. DevKit covers JSON, diffs, regex, Base64, and URL encoding. FinKit applies standard formulas to the numbers you enter so you can explore loan and everyday money scenarios — educational estimates, not advice.
Each kit is a collection of single-purpose pages rather than one crowded dashboard. That layout makes it easier to land on the exact job you need — shrink a JPEG for a portal, pretty-print an API response, or sketch an amortization schedule — without hunting through unrelated features or creating an account.
Most image and developer tools process input on your device with browser APIs. We do not run an upload pipeline for those workflows, so the files and snippets you paste are not sent to our servers as part of the tool itself. Finance calculators are pure math on the numbers you type; they do not connect to banks or pull live market rates.
Beside every kit you will find short guides that explain formats, debugging habits, and money-math basics in plain language. The tools do the work; the guides explain the tradeoffs so you can choose the right approach. We keep the product intentionally simple: open a tool, paste or upload input, download or copy the result. Read more on About or reach us via Contact.
How to choose a kit
Start with ImgKit when a website rejects HEIC or WebP, when an email attachment is too large, or when a form demands a maximum file size or pixel dimensions. Start with DevKit when you are staring at messy JSON, comparing two config files, testing a regular expression, or encoding a string for a query parameter. Start with FinKit when you want to see how a loan payment, tip, percentage, or APY estimate works before you talk to a bank or open a spreadsheet.
If you are unsure which page to open, skim the kit home for that category — each one lists tools and related guides so you can jump straight to the workflow that matches your task.
Guides from the kits
Practical explainers that sit next to the tools — formats, debugging habits, and money math basics.
- How to Reduce Image Size for Email Attachments
Practical ways to shrink JPEGs and PNGs so photos fit common email size limits without looking terrible.
- HEIC vs JPG: When to Convert iPhone Photos
What HEIC is, why websites reject it, and when converting to JPG is the right move.
- PNG to JPG: How to Convert Without Ruining Quality
When PNG-to-JPEG conversion makes sense, how lossy compression works, and how to keep photos sharp while shrinking file size.
- WebP vs PNG vs JPG: Which Format Should You Use?
A practical comparison of WebP, PNG, and JPEG for web, email, and uploads — plus when to convert between them.
- Resize Images for Instagram, LinkedIn, and Web Forms
Recommended dimensions, aspect ratios, and file-size targets when resizing photos for social platforms and strict upload forms.
- How to Pretty-Print and Validate JSON
Why formatted JSON matters for debugging APIs, how minified payloads differ, and how to catch syntax errors early.
- Regex Testing Basics for Developers
A practical intro to testing regular expressions: flags, capture groups, and how to avoid catastrophic patterns.
- JSON Minify vs Pretty Print: When to Use Each
How minified and formatted JSON differ in size and readability, and where each belongs in development and production.
- How to Read a Text Diff (Unified and Side-by-Side)
Understand added and removed lines, hunk headers, and context lines so code and config diffs become useful instead of noisy.