# Overlay

Browse 26 online overlay tools for working with overlay-related files and data. Use them in your browser; text inputs are not stored and uploaded files are deleted after 6 hours.

> Canonical page: https://elysiatools.com/en/tags/overlay

## Overview

Explore 26 overlay tools for working with overlay-related files and data through a browser interface, with no software installation required.

## Frequently asked questions

### What can I do with Overlay tools?

You can use this collection of 26 tools to work with overlay-related files and data through your browser interface.

### How is my data handled?

Tools are operated in your browser, while processing runs on Elysia Tools servers. Text inputs are not stored, and uploaded files are automatically deleted after 6 hours.

### Do I need to install software?

No software installation is required. Open an Overlay tool in your browser and follow its available workflow.

## Tools

- [Audio Mixer](https://elysiatools.com/en/tools/audio-mixer): Mix two audio files together with customizable timing control
- [Audio Overlay](https://elysiatools.com/en/tools/audio-overlay): Overlay one audio track on top of another at a specific time
- [Central Limit Theorem Demonstrator](https://elysiatools.com/en/tools/central-limit-theorem-demonstrator): See the Central Limit Theorem in action: draw samples from a non-normal source distribution (uniform, exponential, Poisson, or Bernoulli), plot the histogram of sample means, and overlay the predicted Normal curve N(μ, σ²/n). Compare empirical vs theoretical mean and standard error, and watch convergence tighten as the sample size grows.
- [Image Gradient Overlay](https://elysiatools.com/en/tools/image-add-gradient): Add gradient overlay effects to images with customizable colors, directions, and blend modes
- [Add Pattern Effect](https://elysiatools.com/en/tools/image-add-pattern): Add geometric pattern overlays to images with customizable colors, size, and rotation
- [Add Texture Effect](https://elysiatools.com/en/tools/image-add-texture): Add various texture overlays to images with customizable blend modes and intensity
- [Image Boolean AND](https://elysiatools.com/en/tools/image-boolean-and): Apply bitwise AND operation between two images to create intersection mask
- [Image Composite](https://elysiatools.com/en/tools/image-composite): Composite multiple images together with precise control over position, opacity, and blend modes
- [Image Multiply Blend](https://elysiatools.com/en/tools/image-multiply): Apply multiply blend mode between two images to create shadow effects and darken colors
- [Image Overlay Blend](https://elysiatools.com/en/tools/image-overlay): Apply overlay blend mode between two images to enhance contrast and create dramatic effects
- [Image Screen Blend](https://elysiatools.com/en/tools/image-screen): Apply screen blend mode between two images to create brighter, more luminous effects
- [Image Color Tint](https://elysiatools.com/en/tools/image-tint): Apply color tint to images to create vintage, artistic, or mood effects with precise color control
- [Image Vintage Effect](https://elysiatools.com/en/tools/image-vintage): Apply nostalgic vintage effects including fading, vignetting, texture overlay and color adjustment
- [Image Watermark Tool](https://elysiatools.com/en/tools/image-watermark): Add text watermarks to images with customizable position, color, size, and transparency
- [Image Watermark Corner](https://elysiatools.com/en/tools/image-watermark-corner): Add corner watermarks to images with customizable positioning, size, opacity, and multiple corner options
- [Image Watermark Diagonal](https://elysiatools.com/en/tools/image-watermark-diagonal): Add diagonal watermarks to images with customizable angle, size, opacity, and positioning across the image
- [Image Watermark Image](https://elysiatools.com/en/tools/image-watermark-image): Add image watermarks to images with customizable position, size, opacity, and rotation
- [Image Watermark Opacity](https://elysiatools.com/en/tools/image-watermark-opacity): Add watermarks with custom opacity to images, supporting both text and image watermarks with advanced opacity controls
- [Image Watermark Tile](https://elysiatools.com/en/tools/image-watermark-tile): Add tiled watermarks to images with customizable spacing, size, opacity, and pattern options
- [PDF Stamp Annotations](https://elysiatools.com/en/tools/pdf-stamp-annotations): Apply visual stamp overlays like REVIEWED, CONFIDENTIAL, or DRAFT to selected pages
- [PDF Watermark Tool](https://elysiatools.com/en/tools/pdf-watermark-tool): Apply document-level or page-level text/shape watermarks with rotation and transparency
- [Telescope Field of View Calculator](https://elysiatools.com/en/tools/telescope-field-of-view-calculator): Compute telescope optics for visual astronomy: magnification, true field of view, focal ratio, exit pupil, limiting magnitude, Dawes/Rayleigh resolution and useful-magnification range. Enter aperture, telescope focal length, an eyepiece focal length and its AFOV (metric mm or imperial inches), pick a target (deep-sky, planetary, lunar or terrestrial), and get a scaled field-of-view overlay plus target-specific advice on exit pupil and framing.
- [Batch Video Watermark](https://elysiatools.com/en/tools/video-batch-watermark): Add text watermark to multiple video files with customizable position, font size, color, opacity, and timing
- [Video Overlay](https://elysiatools.com/en/tools/video-overlay): Overlay one video on top of another video

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