MrTools guides
Practical guides for everyday tasks
Clear workflows, real limitations and direct paths to tools that run locally in your browser.
How to reduce an image’s file size
Choose between resizing and compression by identifying whether pixels or encoding cause the file size.
Read guideHow to merge PDF files safely
A reliable merge starts with readable source files, deliberate order and a final page check.
Read guideHow to format and validate JSON
Formatting makes JSON readable; validation confirms that the data follows JSON syntax.
Read guideHow to count words and characters accurately
Word, character and line counts answer different questions and depend on clearly stated rules.
Read guideHow to calculate percentage change
Percentage change compares a new value with an old baseline; the denominator and zero case matter.
Read guideCreate useful and reliable QR codes
Choose the correct QR content type, keep the payload concise and test the result on another device.
Read guideHow to compare financial scenarios
How to compare financial scenarios: a practical workflow for entering information, reviewing assumptions and saving a useful result without uploading data.
Read guideHow to calculate dates and working time
How to calculate dates and working time: a practical workflow for entering information, reviewing assumptions and saving a useful result without uploading data.
Read guideHow to create useful document templates
How to create useful document templates: a practical workflow for entering information, reviewing assumptions and saving a useful result without uploading data.
Read guideHow to review a Chilean document template
How to review a Chilean document template: a practical workflow for entering information, reviewing assumptions and saving a useful result without uploading data.
Read guideHow to clean and verify structured data
How to clean and verify structured data: a practical workflow for entering information, reviewing assumptions and saving a useful result without uploading data.
Read guideWeb quality and accessibility checklist
Web quality and accessibility checklist: a practical workflow for entering information, reviewing assumptions and saving a useful result without uploading data.
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