Tools starting with A

Add a solid border of any width and colour around an image.

Add a header, footer or page numbers to every page of a PDF as real selectable text.

Place a PNG or JPEG onto chosen pages of a PDF, sized as a share of the page width.

Wrap text to a set width, or break it after every sentence, without splitting words.

Find the date a number of days, weeks or months before or after another date.

Stamp page numbers onto a PDF, with position, format and starting number under your control.

Add captions to an image with an outline that stays readable over anything.

Place text on chosen pages of a PDF, with a font, size, colour and position that repeat across pages.

Draw a diagonal text watermark across a PDF, with colour, size, angle and opacity control.

Brighten or darken a photo without other editing.

Increase or reduce the difference between light and dark tones.

Make colours more vivid or more muted, up to full greyscale.

Calculate exact age in years, months and days, plus total days and the next birthday.

Convert between degrees, radians, gradians, turns, arcminutes and arcseconds.

Calculate area, perimeter and volume for circles, rectangles, triangles and common solids.

Convert between square metres, square feet, acres, hectares and square miles.

Generate Article or BlogPosting JSON-LD with author, dates and image.

Scale width and height while keeping the aspect ratio, and identify the ratio itself.

Convert audio between formats in your browser — MP3 or WAV out, with bitrate, sample rate and channel controls.

Add a fade in, a fade out or both, with a choice of curve that actually matters.

Join several audio files into one, with a gap or a crossfade between them.

Strip ID3 and other metadata from an audio file without re-encoding the audio.

Read the ID3 tags stored in an MP3 — title, artist, album and more.

Measure peak and average levels, then scale the file to a target peak.

Find and remove silent sections from a recording, with a threshold you control.

Play audio faster or slower, with the pitch shifting the way a record does.

Cut a section out of an audio file by dragging the range across a waveform.

Find the mean, median, mode, range and standard deviation of a list of numbers.

Convert AVIF images to JPG in your browser, with no upload and no watermark.

Convert AVIF images to PNG in your browser, with no upload and no watermark.