Real-time compatibility checking, instant bottleneck detection, and data-driven gaming estimates. Everything you need to design your dream machine, without the guesswork.
01 / VALIDATION
Socket matching, DDR generation validation, and wattage headroom verification run locally in real time on every selection.
02 / PERFORMANCE
Derived from normalized benchmark suites to highlight where CPU or GPU limits frame delivery across resolutions.
03 / GAMING
Realistic FPS telemetry across modern triple-A titles based on the GPU, CPU, and memory bandwidth you select.
04 / EFFICIENCY
Identify wasted budget before you buy. Balanced component allocation delivers more performance per dollar spent.
05 / POWER
Continuous wattage summation with built-in safety margins ensures your power supply never falls short under load.
06 / PRIVACY
No sign-ups, no user tracking, and no saved-state cookies. Share builds with a single deterministic URL.
Building a custom PC can feel overwhelming, especially if you are doing it for the first time. With hundreds of components across dozens of categories, choosing the right parts that work together within your budget is a challenge. Build PC Online was built to simplify that process. Our free online PC builder gives you everything you need to plan a custom gaming PC, productivity workstation, or general-purpose desktop without spending hours cross-referencing spec sheets and compatibility lists.
Unlike basic part-picker tools that only list components, Build PC Online provides an interactive visual experience. Browse through GPUs from NVIDIA and AMD, explore the latest Intel and AMD Ryzen processors, pick the right motherboard chipset, select DDR5 or DDR4 RAM at the right speed, choose NVMe or SATA storage, and configure your cooling solution and power supply - all in one place with real-time feedback on compatibility and total system power draw.
Our recommendation engine does not guess. It uses normalized performance scores derived from published benchmarks. For GPUs, scores come from 3DMark Time Spy, Fire Strike, and PassMark tests. For CPUs, we weight Cinebench R23 single-core and multi-core results based on your selected use case. Gaming builds prioritize single-thread performance and GPU power, while productivity builds weight multi-thread throughput and fast storage higher.
When you set a budget, the engine allocates spending across categories using proven ratios. A gaming-focused build directs more budget toward the GPU, while a balanced build spreads funds more evenly. You can always override any recommendation and pick components manually - the tool adapts to your choices and continues checking compatibility regardless of how you build.
We display researched market price ranges for every component based on pricing data gathered from Amazon, Newegg, Best Buy, B&H Photo, and Micro Center. These are typical price ranges, not live feeds. For every component, we provide direct links to major retailers so you can check current pricing and availability. Build PC Online does not sell components directly and does not earn affiliate commissions.
Build PC Online runs entirely in your browser. Your build configuration, theme preference, and budget settings are stored locally on your device - never on our servers. There is no account to create, no email to verify, and no data to worry about. Whether you are researching parts for a budget gaming PC under $800 or planning a no-compromise enthusiast setup with the latest RTX 4090 and Ryzen 9 7950X, Build PC Online gives you the tools to build with confidence.
Everything you need to know about building your custom PC with our tool.
Build PC Online is an interactive, visual PC builder and comparison tool. Unlike basic compatibility checkers that only verify whether cables plug in, our engine analyzes your components to detect bottlenecks, estimate real-world gaming frame rates, and optimize your budget allocation across parts.
Yes, 100% free. There are no paid features, no premium tiers, and no hidden subscriptions. You get complete access to all planning tools, compatibility checks, bottleneck calculators, and export features without spending a cent.
We aggregate historical market data from major hardware retailers (including Amazon, Newegg, Best Buy, B&H Photo, and Micro Center) to provide realistic price ranges. Because retail pricing fluctuates constantly, our prices reflect typical market rates rather than live real-time feeds. They serve as reliable planning estimates so you can budget accurately before heading to checkout.
Absolutely. Your build is automatically saved to your browser’s local storage as you work, so you can return anytime without losing progress. When you’re ready to share, click the Share button to generate a unique link with your exact configuration encoded. Anyone opening the link will see your complete build instantly.
Our validation engine evaluates several dimensions of hardware compatibility: CPU socket matching with motherboards, RAM generation compatibility (DDR4 vs DDR5), power supply wattage headroom based on estimated total system draw, physical clearance (GPU length vs case capacity, CPU cooler height vs case width), and interface compatibility (M.2 NVMe slots, PCIe lanes).
Our performance estimates are calculated using normalized benchmark data from extensive synthetic tests (3DMark Time Spy, Cinebench R23, Geekbench) combined with real-world in-game telemetry across dozens of popular titles at 1080p, 1440p, and 4K resolutions. The bottleneck indicator analyzes whether your CPU or GPU will be the primary performance limiter based on your selected use case.
No. Build PC Online is purely a planning and validation platform. We do not sell hardware directly, hold inventory, or process transactions. When you’re ready to purchase, we provide direct search links to trusted retailers so you can find the best current price.
Click the "Share" button in the top navigation bar or the build summary panel. This copies a unique URL to your clipboard containing your entire component selection encoded into the link. You can paste this URL into Discord, Reddit, forums, or send it directly to friends. When they open it, the builder will load your exact configuration.
Yes. All build planning happens entirely inside your browser. We do not require an account, we do not track your personal identity, and we do not store your component configurations on a server unless you explicitly generate a shareable link. Your data stays on your machine.
Build PC Online is built with modern web standards and works seamlessly on Google Chrome, Mozilla Firefox, Apple Safari, and Microsoft Edge. It is fully responsive and supports desktop computers, laptops, tablets, and smartphones with touch-friendly controls and adaptive layouts.
Our builder automatically checks compatibility in real time as you select parts. It verifies the CPU socket against the motherboard socket, ensures DDR4 or DDR5 RAM matches the motherboard slot type, checks that your power supply delivers sufficient wattage with safety headroom, and validates that your GPU and CPU cooler physically fit inside the selected case.
A bottleneck occurs when one component limits the overall performance of the entire system because it cannot keep up with faster parts. The most common bottleneck is pairing an entry-level CPU with an ultra-high-end graphics card (or vice versa). Our built-in bottleneck indicator highlights significant mismatches so you can choose balanced parts.
No. DDR4 and DDR5 memory use completely different physical slot designs, pin configurations, and operating voltages. A motherboard supports either DDR4 or DDR5, never both simultaneously. Our builder automatically filters out incompatible RAM types once you pick a motherboard.
Calculate your total component power draw (mainly CPU TDP and GPU TGP) and add 20% to 30% headroom for transient power spikes, overclocking, and future upgradeability. For example, if your system draws 450W under full load, a quality 650W to 750W 80 PLUS certified power supply is recommended.
Yes, significantly. Smaller cases (like Mini-ITX or compact Micro-ATX) have strict limits on maximum GPU length, CPU cooler height, radiator mounting positions, and power supply form factors (SFX vs standard ATX). Our tool flags potential clearance conflicts before you buy.
You can freely pair an AMD processor with an NVIDIA or Intel graphics card, or an Intel processor with an AMD graphics card. However, your CPU and motherboard must use the same socket family: AMD Ryzen CPUs require AMD motherboards (AM4 or AM5), while Intel CPUs require Intel motherboards (LGA1700, LGA1851, etc.).