Lmaotools

Guides

Practical explanations to choose a format, prepare a file or understand what a process changes.

Workflow

Merge PDFs in the right order

The order in which you add the files is the order of the merged document. Settings before merging, page sizes, weight, protected files and checks.

Updated October 27, 2026 · 2 min read

Trust and data

Create a strong password on your device

Length, character families, randomness: what makes a password strong, how to generate one without sending it anywhere, and how to keep it.

Updated October 22, 2026 · 2 min read

Workflow

Go from CSV to JSON without losing data

Separator, quotation marks, numbers and empty fields: the points that cause trouble when you convert a CSV to JSON, and how to check them.

Updated October 20, 2026 · 2 min read

Workflow

Count the days between two dates

Gap, dates included, working days: three ways of counting the same interval, and the traps of months, leap years and the clock change.

Updated October 14, 2026 · 3 min read

Workflow

Number the pages of a PDF and add a watermark

Area, alignment, format and first number to number a PDF, page range, free or tiled text watermark, opacity and legibility of the document.

Updated October 9, 2026 · 3 min read

Quality and formats

Convert a voice recording without damaging it

MP3, AAC, OGG or FLAC for a voice: the weight of each format, what volume normalization changes, and why to avoid compressing the same recording several times.

Updated October 6, 2026 · 2 min read

Workflow

Resize an image without distorting it

To get an image at a precise format without distorting it: the order to follow, what the fit settings do, enlarging and choosing the output format.

Updated September 28, 2026 · 2 min read

Quality and formats

Which image format to choose by use

JPG, PNG, WebP or AVIF: the right format depends on what the image shows. Weight of each format on a photograph, a screenshot and a logo, and when to avoid each.

Updated September 22, 2026 · 2 min read

Workflow

Delete or extract pages from a PDF

Delete, extract or split: three neighboring actions on a PDF. Which to choose depending on what you keep, how to write the pages and what the result keeps.

Updated September 6, 2026 · 2 min read