Free tools that run in your browser
PDFs, images, code, and numbers. One search, no install.
No sign-up. Your files stay on your device.
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Popular tools
The most-used tools across the collection, hand-picked for everyday work.
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Developer Tools
17 tools, all free and browser-based.
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Finance Tools
9 tools, all free and browser-based.
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Productivity
3 tools, all free and browser-based.
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PDF Tools
6 tools, all free and browser-based.
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Image Tools
5 tools, all free and browser-based.
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Diff Tools
5 tools, all free and browser-based.
What is TheToolSera?
TheToolSera is a collection of 45 single-purpose web utilities for the small technical jobs that come up during a normal working day: making a minified API response readable, getting a PDF under an upload limit, shrinking an image before publishing it, checking what changed between two drafts, or working out what a loan actually costs. Each tool opens on its own page with one workspace and no setup step.
The problem it solves
These tasks are too small to justify installing software, and the usual alternative is an ad-heavy converter that asks you to upload the file first. TheToolSera keeps the job on one page: paste or drop your input, get the result, copy or download it, and move on.
Who it is for
Developers and QA engineers working with JSON, tokens and regular expressions; office teams, students and freelancers handling PDFs and images; reviewers and auditors comparing two versions of something; and anyone who wants a calculator that shows the figures from the numbers entered.
How the processing works
Most tools run in the browser tab: text is parsed with JavaScript, PDFs are rewritten with a client-side PDF library, and images are decoded and re-encoded through the canvas. Expense Insights and Paper Plate Business Calculator send specific fields. Those requests are listed on the Privacy page. There is no account.
What each category covers
Developer Tools
17Read and reshape the formats that move between systems: format and validate JSON, convert CSV to JSON, decode a JWT, test a regular expression or lay out a long SQL query.
Finance Tools
9Loan, mortgage, investment and tax calculators that show the schedule behind the headline figure, so two scenarios can be compared properly.
Productivity
3Small everyday helpers — timed focus sessions, Markdown notes kept in this browser, identifier generation and date arithmetic.
PDF Tools
6Last-mile document work — merge a set of files into one, pull out a page range, bring a file under a size limit, add or remove a password, or place a signature.
Image Tools
5Prepare images for publishing: compress to a target size, convert between PNG, JPG and WebP, crop to an aspect ratio, edit on a canvas or lift a subject off its background.
Diff Tools
5Compare two versions of text, documents, spreadsheets, images or folders with aligned highlights, for when the change did not go through version control.
Why there is no sign-up
Because the work happens on your device, there is nothing for an account to store. Preferences such as your theme, favourites and recently used tools are kept in this browser's local storage, so they follow you between visits on the same device but are never synced anywhere. If you clear your browsing data, those preferences — and anything saved in the notes tool — are cleared with it, so export anything you want to keep.