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Tools Guides Library

Guides

Practical, dated walkthroughs for the jobs these tools do — written and maintained by Dzzz AI.

Media

Compress a video for WhatsApp without a visible quality hit WhatsApp caps videos at 16 MB and re-encodes what you send. Here is how to get under the cap on your own terms, on your device. 26 Sept 2026 · 5 min read
Trim a video without re-encoding (and when you must) Cutting a clip doesn't have to mean waiting for a full re-encode — how dzzz's Trim tool cuts in seconds, and where that speed runs out. 26 Sept 2026 · 4 min read
Turn a video into an MP3 on your device Keep just the sound from a clip, pick a bitrate that fits what it's for, and never send the file anywhere to do it. 26 Sept 2026 · 4 min read

Documents

Arabic document to PDF: why the result is rasterised Turning Arabic Markdown or text into a PDF that actually reads correctly means the download can't have selectable text — here's why, and the Print… path that does give you selectable text. 26 Sept 2026 · 4 min read
Compress a PDF for an upload limit without making it unreadable Government and bank portals cap PDF size hard. Here's how to shrink a PDF on your own device, keep it readable, and check it before you upload. 26 Sept 2026 · 4 min read
Merge PDFs in the right order Combine several PDFs — and images — into one file, drag them into the order you need, and don't let one bad file ruin the whole merge. 26 Sept 2026 · 4 min read

Data & Files

Compare two exports and see exactly what changed Compare two spreadsheet exports by a key column and get exact counts of what was added, removed and changed — including a route for files too large to compare in the page. 26 Sept 2026 · 4 min read
Dedupe a customer list without losing the right row Remove duplicate rows from a customer list by the columns that actually identify a person, choose which copy survives, and check exactly what was removed. 26 Sept 2026 · 4 min read
Merge monthly CSV exports into one file Stack a folder of monthly spreadsheet exports into one table with the columns lined up, then tidy the result with Clean CSV. 26 Sept 2026 · 4 min read

Generators

A password worth keeping: length, randomness, and what "strong" means Generate random passwords and passphrases on your device, understand why length and true randomness matter, and read the strength estimate for what it is. 3 Oct 2026 · 5 min read
Colour contrast for accessibility, with the checker Check text and background colours against the WCAG contrast thresholds, understand the large-text rule, and know where a contrast ratio stops being enough. 3 Oct 2026 · 5 min read
QR codes that contain Arabic (and why some readers show garbage) Make a QR code with Arabic text that decodes correctly, check it by scanning it back, and pick a size, colours and logo that stay readable. 3 Oct 2026 · 5 min read

Calculators

BMI: what the number means and what it cannot tell you How BMI is calculated, how the WHO adult bands read, and why one number from height and weight cannot describe muscle, age, ethnicity or your health. 3 Oct 2026 · 5 min read
GPA on the Saudi 5.0 scale (and converting to 4.0) How the Saudi 5.0 and 4.0 scales differ from each other and from the US 4.0 scale, how to work out a GPA by credit hours, and how to plan a target without fooling yourself. 3 Oct 2026 · 5 min read
Loan payments and APR, explained with the calculator How a monthly loan payment is built, why an advertised flat rate understates the real cost, and how to compare offers by total cost instead of the monthly figure. 3 Oct 2026 · 5 min read

Saudi & Islamic

Check a Saudi IBAN before you transfer Validate a Saudi IBAN's structure and MOD-97 checksum, see which bank it points to, and write the amount in Arabic words, all on your device. 3 Oct 2026 · 5 min read
End-of-service pay in Saudi Arabia, with a worked example How the Saudi Labor Law's end-of-service award is calculated under Articles 84 and 85, with a full worked example and the resignation fractions. 3 Oct 2026 · 5 min read
What a ZATCA e-invoice QR contains and how to read one The five fields inside a Saudi simplified e-invoice QR, how the Base64 and TLV encoding works, and how to read one on your device without uploading anything. 3 Oct 2026 · 5 min read

Everyday

Coffee ratios: why 1:16 doesn't give you 1:16 in the cup Work out how much coffee and water to use, and how much actually reaches the cup once the grounds have kept their share, with cumulative pour targets for the scale. 3 Oct 2026 · 4 min read
Set a call time across Riyadh, London and Manila Pick a call time that works in Riyadh, London and Manila, understand why the gap to London changes twice a year, and work out when a flight lands on the arrival city's clock. 3 Oct 2026 · 5 min read
Scale a recipe for more guests without ruining it Resize a recipe for a bigger table with sensible rounding, then sanity-check spices, pan size and cooking time and plan how much to buy with a range, not a promise. 3 Oct 2026 · 4 min read

AI & Speech

Blur people in a photo before you share it Hide bystanders and private details in a photo on your device, using detected boxes or ones you draw, and choose between blur and pixelate. 3 Oct 2026 · 4 min read
Remove a photo background on your device Cut the background out of a photo without uploading it, save a transparent PNG, and know when to use the batch product-photo tool instead. 3 Oct 2026 · 4 min read
Transcribe a meeting on your device, no upload Turn a meeting recording into editable, timestamped text without uploading the audio, choose the right model size, and understand the one optional step that does leave your device. 3 Oct 2026 · 5 min read

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