Guides & how-tos

How to Remove a Password from a PDF

Unlock a PDF you own so you can edit or re-save it — using Adobe Acrobat, Preview on Mac, or FileToolsHub’s unlock tool in the browser.

How to Sign a PDF Without Printing

Add a signature to a PDF on screen — draw in Preview or Acrobat, or use FileToolsHub’s sign tool when you need a quick download.

How to Split a PDF Into Separate Pages

Save one page per file or pull selected pages out of a PDF — with Preview, Acrobat, or FileToolsHub split and extract tools.

How to Convert Photos to PDF on iPhone

Turn camera roll pictures into one PDF from the iPhone Share sheet, Files, or FileToolsHub when you need merge and download on desktop.

How to Convert EPUB to PDF

Read ebooks on printers and PDF-first apps with Calibre on desktop or FileToolsHub's epub-to-pdf converter for handouts.

PDF Online vs Desktop Apps for Quick Edits

When a free browser PDF tool on FileToolsHub is enough — and when you still need Acrobat or a desktop suite. Clear privacy and workflow comparison.

Office Files to PDF, Signatures, and Form Flattening

Turn Word, Excel, or PowerPoint into PDF for portals; extract text; sign, crop, flatten, and ZIP pages without installing Office.

Compress a PDF for Email (and When Splitting Is Smarter)

Gmail and Outlook reject oversized PDFs. Here’s how to shrink scans and packets — and when to split or merge instead.

Protect a PDF Before You Send It to a Client

A short checklist: finalize the packet, compress if needed, watermark when useful, then password-protect — and share the password separately.

Merge Then Compress: The Email-Ready PDF Packet

Why merge alone is not enough for Gmail: combine the files first, then shrink the result so it fits inbox limits.

PDF to Word When You Actually Need to Edit

Use PDF to Word for revisions and comments. Export a JPG or PNG when you only need a snapshot of one page to send.

Add Page Numbers and Watermarks Before You Send

Stamp page numbers and a CONFIDENTIAL/DRAFT watermark locally, then password-protect when access control matters.

How to Merge PDFs Online for Free

Combine invoices, contracts, or scans into one PDF in your browser — no Acrobat install, no watermark for everyday jobs.

How to Convert HEIC to JPG on Windows

Open iPhone photos on a PC by converting HEIC to JPG — using Windows Photos, Paint, or a free browser converter on FileToolsHub.

How to Reduce Image Size in KB

Shrink JPG and PNG file weight for uploads, email, and forms — resize dimensions, compress quality, or use FileToolsHub in the browser.

How to Convert WebP to JPG

Turn WebP images into JPG for email, print, and older apps — using Preview, Paint, command-line tools, or FileToolsHub’s browser converter.

How to Create an Open Graph Image

Design a 1200×630 social preview card for links — in Figma, Canva, or FileToolsHub's browser-based OG image maker.

How to Convert SVG to PNG

Rasterize logos and icons for slides, email, and OG tags with Inkscape, a browser export, or FileToolsHub when you need pixels.

Turn Phone Photos into a PDF for Portals

Shoot the form, upload the JPGs in page order, download one PDF, then compress it if the portal still rejects it.

Convert JPG/PNG to WebP for Faster Landing Pages

Cut hero weight with browser-side WebP conversion — resize to display width first, keep masters, check CMS support.

Resize Then Compress Images for the Web

Too many pixels and too many bytes are different problems. Fix the dimensions first, then shrink the file weight.

How to Convert Excel to CSV

Export spreadsheets for scripts, databases, and imports — using Excel, Google Sheets, LibreOffice, or FileToolsHub.

How to Convert Excel to JSON

Turn an Excel worksheet into a JSON array of row objects in seconds — free, browser-based, no signup required.

When CSV Exports Open as One Column in Excel

Wrong delimiter or encoding dumps every field into column A. Convert the export to an Excel workbook to restore real columns.

How to Format JSON

Pretty-print and validate JSON using editor tooling, command-line utilities, or FileToolsHub’s JSON formatter and validator.

Excel to JSON for API Fixtures (No One-Off Script)

Turn a stakeholder spreadsheet into an array of objects for mocks and seeds, then validate and format the JSON.

Pull Nested API Fields with JSONPath

Evaluate a nested path such as data.items[0].id on a large payload without uploading it or installing jq locally.

JSON Formatter vs Validator: Which Do You Need?

Pretty-print for reading. Validate for missing commas and broken braces. Both run in your browser on FileToolsHub.

How to Decode a JWT Token

Inspect JSON Web Token headers and payloads in the browser, without pasting the token into a public decode website.

How to Create a Strong Password

Length, uniqueness, and manager-friendly habits, plus random passwords from FileToolsHub's generator for new accounts.

Password Generator vs Strength Meter

Create a new random password, or score one you already typed — two different jobs, both private in the browser.

Diceware Passphrase vs Random Password

Memorable word phrases for typing; high-entropy random strings for password managers. Pick based on how you’ll enter the secret.

How to Calculate the Percentage of a Number

Find X% of Y with the standard formula, mental shortcuts, spreadsheet cells, or FileToolsHub’s percentage calculator in the browser.

How to Calculate EMI

Estimate equated monthly installments for loans using the standard formula, spreadsheet functions, or FileToolsHub’s EMI calculator.

How to Calculate BMI

Compute body mass index from height and weight using metric or imperial units—with a spreadsheet, pen and paper, or FileToolsHub’s BMI calculator.

EMI vs Loan vs Mortgage Calculator

Same family of math, different inputs: known principal (EMI), general amortization (loan), or price + down payment (mortgage).

SRT vs VTT: Which Subtitle Format for HTML5 Video?

Use SRT for editors and vendors, and WebVTT for an HTML5 track element. Convert either way in the browser before you publish.

QR Codes for Campaign Links vs Guest Wi‑Fi

Use a URL code for a marketing poster, and a Wi-Fi payload for a cafe or office network. Do not mix the two formats.

Regex Cheat Sheet: Patterns That Cover Most Tasks

Anchors, character classes, quantifiers, and groups — practice on FileToolsHub's regex tester and cheat sheet.

UUID vs Nano ID vs ULID: Which Should You Use?

A plain comparison of UUID, Nano ID, and ULID — size, readability, sortability, and when each makes sense. Generate any of them free.

How to Open CSV in Excel Without Losing Leading Zeros

Keep ZIP codes, SKUs, and IDs intact — import CSV via Data → From Text/CSV or use FileToolsHub's csv-to-excel tool.

How to Trim Audio

Cut silence and keep the middle of a clip using Audacity, GarageBand, ffmpeg, or FileToolsHub’s audio trimmer.

How to Calculate Profit Margin

Gross and net margin from revenue and costs, using spreadsheet math or FileToolsHub's profit margin calculator.

How to Write the Amount in Words on a Cheque

Line up the numeric and written amounts on checks—by hand, with bank rules, or using FileToolsHub amount-in-words tools.

Cron Expression Examples for Schedulers

Readable cron patterns for Linux crontab, GitHub Actions, and cloud jobs, with a builder on FileToolsHub you can paste.

How to Check Screen Resolution

Find your display’s pixel dimensions in Windows, macOS, Linux, and the browser—with FileToolsHub’s screen resolution tool.

How to Remove Location Data from Photos

Strip GPS and other EXIF metadata before sharing—using Photos, ExifTool, or FileToolsHub’s strip-image-exif tool.

How to Make a Favicon

Create ICO and PNG favicons for browsers and PWA manifests—from design apps, CLI converters, or FileToolsHub generators.

How to Calculate Compound Interest

Grow savings and loan balances with compounding — spreadsheet formulas, pen-and-paper, or FileToolsHub's calculator.

How to Calculate One-Rep Max (1RM)

Estimate max strength from submaximal sets using common formulas, plus FileToolsHub's one-rep max calculator for the gym.

How to Test Your Microphone on Windows

Confirm Windows hears your mic in Settings, Sound Control Panel, and apps—plus browser checks with FileToolsHub’s microphone test.

How to Make Your Resume ATS-Friendly

Help applicant tracking systems parse your resume — structure, headings, and wording — plus an ATS score check on FileToolsHub.

How to Write a Good Meta Description

Write concise search snippets that match intent — manually, with CMS fields, or using FileToolsHub's AI meta description helper.

How to Increase Typing Speed

Build accuracy first, then words per minute—with touch-typing drills, ergonomic setup, and FileToolsHub’s typing speed test.

How to Convert Unix Timestamp to Date

Seconds versus milliseconds, and UTC versus local time, using the command line, JavaScript, or FileToolsHub on a log line.

How to Check If Your Webcam Is Working

Verify the camera feed on macOS, Windows, and Linux with system apps, or a quick browser preview on FileToolsHub.