Guides
Choose a workflow for homework, client files, product photos, office attachments or debugging. Each guide links to the tools used in its steps.
Students
How to submit homework photos as one PDF
Turn homework photos into one readable PDF, check page order and prepare a school submission in your browser.
Updated 2026-10-04
Freelancers
How to prepare a freelance invoice and client files
Create a simple invoice PDF, check line-item totals and organize client attachments without an account.
Updated 2026-10-04
Online sellers
How to prepare product images for an online store
Prepare product photos, remove simple backgrounds, compress JPEG copies and verify a store QR code.
Updated 2026-10-04
Office workers
How to prepare PDF attachments for office email
Combine office PDFs, extract requested pages and check attachments before sending them to colleagues.
Updated 2026-10-04
Developers
How to debug JSON, Base64 and cron in your browser
Validate JSON, round-trip Base64 text and check five-field cron syntax using local browser tools.
Updated 2026-10-04
How to merge PDF files in your browser
Combine several PDFs into one file without an account or a file-upload service. What merge keeps, and what it does not.
Updated 2026-09-24
How to extract pages from a PDF
Keep only the pages you need. How page ranges work, and why this is not the same as “explode every page into its own file.”
Updated 2026-10-04
How to convert JPG or PNG images to PDF
Turn photos or screenshots into an A4 PDF in the browser. When to use JPG vs PNG, and what “A4” means for panoramas.
Updated 2026-09-24
How to turn PDF pages into JPG images
When a raster export is useful, what 2× rendering means, and why this is not OCR.
Updated 2026-09-24
How to compress an image without an upload
Use a quality slider and a 2400-pixel cap to shrink photos for forms and email. What you lose when the output is JPEG.
Updated 2026-09-24
How in-browser background removal actually works here
An honest look at the optional CDN model, the color fallback, and when you should use a dedicated editor instead.
Updated 2026-09-24
How to generate a password you will actually store
Use Web Crypto randomness, pick a length, and put the result in a password manager. What the strength meter is not.
Updated 2026-09-24
How to make a QR code for a link, email, or Wi‑Fi network
Encode the right payload, pick a size, and remember that a Wi‑Fi QR contains the password in plain sight.
Updated 2026-09-24
How to format and validate JSON
Beautify or minify JSON in the browser, read parser errors, and avoid pasting secrets into a random formatter.
Updated 2026-09-24
How to convert a meeting time between cities
Search source and destination IANA zones in your browser. Handle skipped local times and choose between repeated daylight-saving occurrences.
Updated 2026-10-04
How to create a simple invoice PDF
Line items as description | qty | rate, automatic totals, and the difference between a PDF and bookkeeping software.
Updated 2026-10-04
What “runs in your browser” means on ToolNest
A plain explanation of local processing, localStorage, CDN libraries, the contact form, and future ads.
Updated 2026-09-24
How to count words in the browser notepad
Word, character, and line counts that update as you type, with notes saved only on this device.
Updated 2026-09-24
Understanding five-field cron expressions
Minute, hour, day, month, weekday — what ToolNest’s parser supports, and which cron features it does not.
Updated 2026-09-24
How to hash text (and why you cannot un-hash it)
MD5, SHA-1, SHA-256, and SHA-512 in the browser. Compatibility vs password storage.
Updated 2026-09-24