Answers before algorithms
Guides for working with files privately.
Direct answers, concrete steps, and honest limits. No filler and no advice that depends on uploading sensitive files.
Image privacy
10 guides
How to blur a face, license plate, or address before posting
Obscure private details locally, choose blur, pixelation, or permanent redaction appropriately, and verify the flattened image before sharing.
Read the guide →Image privacyBulk remove backgrounds for Etsy and e-commerce listings
Remove backgrounds from Etsy and e-commerce product photos in free batches of 20, download one ZIP, and understand the real credit-cost tradeoffs.
Read the guide →Image privacyHEIC to JPG explained: compatibility, quality, and batch conversion
Understand HEIC and HEIF, convert an iPhone photo to JPG locally, choose quality carefully, and use honest batch options for larger libraries.
Read the guide →Image privacyPhoto, signature, and PDF size limits for Indian government exams
A maintained, primary-source database of photo, signature, and PDF upload limits for major Indian government exam portals.
Read the guide →Image privacyHow to remove an image background for free without credits
Compare genuinely free background-removal methods, understand remove.bg's official limits, and refine a full-size transparent PNG locally without credits.
Read the guide →Image privacyEXIF metadata: what your photos reveal before you share
Learn what EXIF and GPS metadata can reveal about a photo, then remove location data from a JPEG without reducing image quality.
Read the guide →Image privacyHow to replace a photo background without Photoshop
Cut out a subject locally, place the transparent PNG over a new scene, and match scale, light, colour, edges, and shadow for a believable result.
Read the guide →Image privacyHow to resize an image to exact pixel dimensions for any form
Match an online form's exact width and height without stretching faces, losing important content, or confusing pixels with DPI.
Read the guide →Image privacyHow to shrink an image under 100KB without it looking bad
Reduce a photo below 100KB by fixing dimensions, choosing the right format, and lowering quality in controlled steps while protecting important detail.
Read the guide →Image privacyWebP vs AVIF vs JPG: the best image format for the web in 2026
Choose JPG, WebP, or AVIF based on browser reach, image quality, transparency, encoding speed, and the fallback your website can support.
Read the guide →PDF workflows
18 guides
How to add page numbers to a PDF the right way
Add visible page numbers without covering content, choose the correct starting number and position, and understand when section-aware numbering needs the source document.
Read the guide →PDF workflowsHow to combine PDF and image files into one document
Turn JPG or PNG images into PDF pages, combine them with existing PDFs in the right order, and verify the finished document without uploading it.
Read the guide →PDF workflowsYour USCIS upload keeps failing. Here is what the limit really is.
USCIS publishes one upload figure, 12 MB per file, plus rules on format, encryption and file names that reject documents for reasons unrelated to size. Here is what the agency actually states.
Read the guide →PDF workflowsHow to compress a PDF to 100KB, 200KB, or 500KB
Pick the right PDF size target, reduce the file without hiding quality loss, and verify a 100KB, 200KB, or 500KB result before uploading it.
Read the guide →PDF workflowsHow to compress a PDF to 200KB for SSC or UPSC
Reduce an exam-application PDF toward 200KB without hiding quality loss, and verify the active SSC or UPSC upload rule first.
Read the guide →PDF workflowsHow to edit a PDF free without Adobe
Learn what free PDF editors actually change, how current limits differ, and how to add text, images, marks, and links without uploading your PDF.
Read the guide →PDF workflowsHow to fill a PDF form on your phone
Complete interactive or flat PDF forms on iPhone or Android, choose whether to flatten fields, recover local work, and verify the result before submitting.
Read the guide →PDF workflowsHow to merge PDF files privately without uploading your documents
Combine PDF files locally, preserve page quality, understand document-level limits, and avoid uploading confidential documents.
Read the guide →PDF workflowsHow to merge PDF files on iPhone
Combine PDFs on an iPhone using Apple Preview where available or a private browser workflow, then verify page order and the downloaded result.
Read the guide →PDF workflowsPDF/A, PDF/X, or plain PDF: which one do you need?
Choose plain PDF for everyday use, PDF/A for long-term preservation, or the exact PDF/X profile your commercial printer requests, then validate the result.
Read the guide →PDF workflowsYour PDF is too big for CM/ECF. Here is your court's actual limit.
Federal courts each set their own CM/ECF file size limit, and the published figures run from 7 MB to 200 MB. Here is what individual courts state, with a link to each court's own page.
Read the guide →PDF workflowsHow to properly redact a PDF
Learn why drawing a black box does not remove PDF data, what true redaction must destroy, and how to verify a redacted document before sharing it.
Read the guide →PDF workflowsHow to remove a password from a PDF you own
Take the password off a bank statement, payslip, or policy PDF you own, entirely in your browser, plus what to do when the file refuses to unlock.
Read the guide →PDF workflowsHow to sign a PDF on Windows, Mac, iPhone, or Android
Add a visible signature to a PDF on any common device, choose the right built-in or browser tool, and verify the signed copy before sending it.
Read the guide →PDF workflowsHow to sign a PDF without Adobe Acrobat
Add a visible signature to a PDF without Adobe Acrobat, understand when Apple Markup works, and know when a certificate-backed signature is required.
Read the guide →PDF workflowsHow to split a huge PDF into chapters
Plan chapter boundaries, split a large PDF into clearly named page-range files, and verify bookmarks, links, signatures, and page numbers before sharing.
Read the guide →PDF workflowsWhy a converted PDF never looks right in Word
Converted documents lose their layout because a PDF does not store paragraphs, only glyphs at coordinates. Learn what survives conversion, what cannot, and when to stop converting.
Read the guide →PDF workflowsWhy your PDF is too big to email and 5 ways to fix it
Find what made a PDF too large for email, choose the least destructive fix, and avoid sending an unreadable document just to cross an attachment limit.
Read the guide →File safety
7 guides
Are online file converters safe? How to check whether a tool uploads your files
Learn how to tell whether an online converter uploads your file, inspect browser network activity, and evaluate privacy claims with evidence.
Read the guide →File safetyYour file is too big for the Google Form. Here is how to fix it once
Google Forms rejects an upload when it exceeds the size the form owner set. Here is how to find the real limit, compress once to land under it, and avoid the quality loss that repeated attempts cause.
Read the guide →File safetyDoes using an online file converter make it a processor under GDPR?
Uploading a document to an online converter usually discloses personal data to a third party. Here is what that means for your Article 28 contracts, your Article 30 record, and your transfer assessment.
Read the guide →File safetyWhy QR codes stop working
Most free QR generators encode a link to their own domain and redirect. Learn why printed codes die, and how to make one that outlives the service that made it.
Read the guide →File safetyYour UK visa document did not upload. Here is how to tell.
UK visa evidence goes to commercial partner portals rather than to GOV.UK, and each sets its own upload rules. Here is what GOV.UK actually publishes, and how to confirm a document attached.
Read the guide →File safetyHow to verify a file checksum
Check that a download arrived intact by comparing its SHA-256 against the published checksum, and understand what that check does and does not prove.
Read the guide →File safetyWhy your 24 MB attachment is rejected by a 25 MB limit
Email attachments are encoded before they are sent, which inflates them by roughly a third. Here is why your file is rejected by a limit it appears to fit, and what size to actually aim for in Gmail and Outlook.
Read the guide →Data and CSV
3 guides
How to clean a CSV before importing it
Check delimiters, headers, identifiers, formulas, duplicates, encodings, and row shape before importing a CSV into Excel, a CRM, or a database.
Read the guide →Data and CSVHow to convert Excel to CSV without breaking your data
Export an XLSX worksheet to CSV while protecting leading zeros, long IDs, dates, Unicode text, delimiters, formulas, and row integrity.
Read the guide →Data and CSVCSV vs JSON vs Excel: which format should you use for your data?
Choose CSV, JSON, or Excel based on data shape, types, formulas, formatting, interoperability, automation, and the next person or system using it.
Read the guide →Developer
2 guides
How to decode a JWT safely
Decode JWT header and payload claims locally, distinguish inspection from verification, and avoid leaking bearer tokens into websites, screenshots, logs, and tickets.
Read the guide →DeveloperHow long should a password be?
Password strength is measured in bits of entropy, not in symbols and capital letters. Learn what length actually buys you and why composition rules do not.
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