Guides
Fixes and explainers for the problems that bring people here.
PDF Rotation Will Not Save
Why viewers rotate the view instead of the file, and how to make a rotation permanent.
GuideMerging PDFs Privately
How browser-based merging works, and how to verify a tool is not uploading your files.
GuideWhen PDFs Will Not Merge
The five reasons a merge fails — encryption, signatures, XFA forms, damage, size caps.
GuideSplitting a Signed PDF
Why splitting always invalidates a digital signature, and what to do instead.
GuidePDF Bad Parameter Error
Why Acrobat refuses to save a password-protected PDF, and how to encrypt it anyway.
GuidePDF Will Not Compress
Why re-compressing does nothing, and the three things that genuinely reduce file size.
GuidePDF Will Not Let You Sign
What actually blocks signing in Acrobat, and why most people do not need its signing workflow.
GuideWord Count Not Working
Why the count vanished or disagrees with someone else's, and what really counts toward a limit.
GuideOutlook Signature Disappearing
Why new and classic Outlook lose your signature, and how to keep a copy you can paste back.
GuideQR Code Not Scanning
Size, density, quiet zone and error correction — what actually breaks a code, especially in print.
GuideCheque Amounts in Words
Dollars, cents as a fraction, hyphenation, and why the written line overrides the figures.
GuideWAV File Won't Play
WAV is a container, not a format. Why voicemail WAVs fail, how to check yours, and the fix.
GuideMP3 to WAV and Quality
Why converting cannot restore what MP3 discarded, and when a WAV is still the right choice.
GuideRecording Too Quiet
Why recordings come out quiet, and how to boost one without making it distort.
GuideInflation Calculators Disagree
Different indexes and different periods. Why two calculators give two answers, and which to use.
GuideURL Spaces: %20 or +
Why + only means a space in query strings, and what each language's encoder produces.
GuideInclusive vs Exclusive Days
Why date counts disagree by exactly one day, days versus nights, and how deadlines count.
GuideOdd Aspect Ratios
Why 1366x768 is 683:384, why 21:9 monitors aren't 21:9, and when it matters.
GuideGoogle Photos Export Frame
Find Export frame in the new video editor, and fix it saving the wrong moment.
GuideCombine Voice Memos
Voice Memos can't merge recordings. How to join them into one file without an app.
GuideReverse a Voice Memo
Voice Memos can't play backwards. How to reverse a recording on iPhone without an app.
GuideRoman Numeral Date Tattoos
The order, numeral and year mistakes to check before a Roman numeral date is inked.
GuideExcel Contacts to iPhone
Get a spreadsheet of names and numbers into iPhone Contacts without an app.
GuideOutlook Imports Only One Contact
A .vcf with 200 contacts gives you one in Outlook. Why, and the CSV fix.
GuideiPhone Contacts to Excel
Export iPhone or iCloud contacts and open them as a spreadsheet, no app needed.
GuideGot winmail.dat Instead of a PDF?
Why Outlook sends winmail.dat, how to open it on iPhone, and how the sender stops it.
GuideOpen a .msg File on Mac
Read an Outlook .msg file and save its attachments on a Mac without Outlook.
GuideOpen an EML File on iPhone
Read a saved .eml email and save its attachments in Safari on iPhone.
GuidePDF Pages Different Sizes
Why merged PDFs end up with mixed page sizes, and how to make every page the same.
GuideFilled PDF Form Appears Blank
Why form answers vanish when someone else opens the file, and how to make them show.
GuideFlatten a PDF Without Adobe
Free ways to flatten form fields and comments, and what flattening really locks.
GuideSecured PDF Won't Print
What a PDF permissions password does, and how to lift print and copy restrictions.
GuideBlack Boxes Don't Redact a PDF
Why blacked-out text can still be copied out of a PDF, the 10-second test, and the fix.
GuideRemove Location From Photos
Strip GPS location from a photo before posting or selling, on iPhone or Android.
GuidePicture Sideways When Uploaded
Why photos turn sideways on Teams, Zoom or Outlook uploads, and how to fix them for good.
GuideHide a License Plate in a Photo
Why blur and pixelation can fail, and how to cover a plate or face properly.
GuideMake a Photo Square Without Cropping
Fit the whole picture into a square for Instagram, with a border or blurred background.
GuideChange an Image to 300 DPI
DPI is a label, not detail. Set 300 DPI without resizing, and check you have enough pixels.
GuidePDF Text Line Breaks
Why text copied from a PDF pastes with a break at every line, and how to fix it.
GuideAlphabetize a List in Notes
iPhone Notes can't sort the lines in a note. How to alphabetize a list anyway.
GuideVideo Plays Sideways
Why phone videos end up sideways, and how to fix one without re-encoding.
GuideProrated Rent: 30 or 31 Days?
Why prorated rent calculators disagree, with a worked example of all three methods.
GuideHours and Minutes to Decimal
Why 7:45 is 7.75 hours, not 7.45, plus a quick table and the 7-minute rounding rule.
GuideSplit a Bill With Tax and Tip
Split by item, share tax and tip in proportion, and make the cents add up exactly.
GuideCSV Too Large for Excel
Excel stops at 1,048,576 rows. Split the file into parts that fit, without uploading it.
GuideExcel Removes Leading Zeros
Why 02134 becomes 2134 and long IDs end in zeros, and how to keep them.
GuideWeird Characters Like é in Excel
Why accents turn into é and ’ when Excel opens a CSV, and how to fix it.
GuideCSV Opens in One Column
Why Excel puts a whole CSV in column A, and how to split it into proper columns.
GuideIs This QR Code Safe?
How QR code scams work and how to read where a code really goes before you open it.
GuideVerify a SHA-256 Checksum
Check a download's SHA-256 on Windows or Mac without typing commands, and what a mismatch means.
GuideSong as iPhone Ringtone
The 30-second limit, and how to turn any song into an iPhone ringtone with GarageBand.
GuideMic Only in Left Channel
Why a recording plays in only one ear, how to fix the file, and how to stop it next time.
GuideOpen Publisher Files
Publisher left Microsoft 365. How to open .pub files free and save them as PDF.
GuideCSV "Illegal Quoting" Error
Why Shopify and other imports reject a CSV with "Illegal quoting in line 1", and a free fix.
GuideCanvas Invalid File Type
Why Canvas rejects your submission, including the Google Drive and OneDrive bug, and the fix.
GuideCan ATS Read My PDF Resume?
See the text hiring software gets from your resume PDF, and what to fix.
GuideHomework Photos to One PDF
Combine photos of handwritten work into one PDF that's in order and small enough to submit.
GuideYouTube Thumbnail Over 2MB
Why phone uploads hit YouTube's 2 MB thumbnail limit, and how to get under it.
GuideResume + Cover Letter in One PDF
When to combine them, which goes first, and how to do it without uploading your details.
GuidePoshmark Photos Cut Off
Make listing photos that fit Poshmark's square or 3:4 frame without cropping the item.
GuideRedact a PDF Without Adobe Pro
Why boxes drawn in Edge or Reader leave the text behind, and how to redact for real, free.
GuideiPhone Photos on Chromebook
Chromebooks can't open HEIC. Convert a batch of iPhone photos to JPG without uploading them.
GuideMerge PDFs on a Chromebook
Combine PDFs and Google Docs into one PDF on a Chromebook, free, with no add-on.
GuideVoice Recording in Google Slides
Record your voice as MP3 and add it to a slide, with no extension or app.
GuideConvert to MP3 on a Chromebook
M4A, WebM, MP4 or MOV to MP3 in Chrome, with no extension, no Linux and no upload.
GuideWhy These Exist
Most of these questions have the same shape: something is not working, the error message does not explain why, and the search results are forum threads from 2014. Each guide gives the actual cause and the shortest fix, then points at the tool that does the job.
Every tool on this site runs in your browser, so the files involved are never uploaded — which is usually the right property for the documents these problems tend to involve.